In recent years, religious and political leaders have increasingly spoken of Christianity, Judaism, and Islam as the three “Abrahamic faiths.” The expression is generally intended to emphasize a common historical connection to Abraham and to encourage peaceful relations among Christians, Jews, and Muslims.
Catholics should certainly desire peace among nations. We must oppose religious persecution, treat non-Christians with justice and charity, resist unjust violence, and cooperate with all men of goodwill in matters pertaining to the common good.
But the modern “Abrahamic faiths” movement often goes beyond civil cooperation. It frequently suggests that Christianity, Judaism, and Islam are three parallel expressions of one fundamental religious tradition and that each offers a legitimate path to God.
Such a position is incompatible with the Catholic Faith.
What Is Religious Syncretism?
Religious syncretism is the combining of doctrines, symbols, or worship drawn from different religions into a common spiritual system. It may be explicit, as when Christian worship is mixed with pagan rites, or more subtle, as when contradictory religions are presented as complementary paths to the same divine reality.
This must be distinguished from the legitimate Catholic adaptation of local customs. The Church has always permitted nations to retain whatever is true and good in their cultures, provided that these customs are purified of superstition and error.
Catholic missionaries could adopt local languages, artistic forms, and harmless customs. They could not combine the worship of the Most Holy Trinity with the worship of false gods.
The difference is the difference between conversion and a heretical compromise.
When St. Paul preached at Athens, he used the altar dedicated “To the Unknown God” as a starting point. Yet he did not confirm the Athenians in their religion. He commanded them to repent and proclaimed Jesus Christ risen from the dead.
Authentic evangelization may begin with truths already known by a people. It must end in their conversion to Christ.
Abraham Cannot Be Separated from Christ
The term “Abrahamic religions” may be used in a limited historical sense. Christianity emerged from the history of Israel, while Islam later claimed Abraham as one of its prophets.
But Abraham does not establish the theological equality of Christianity, Judaism, and Islam. In Sacred Scripture, Abraham’s vocation points forward to Jesus Christ. Our Lord declared: “Abraham your father rejoiced that he might see My day: he saw it, and was glad” (John 8:56).
St. Paul likewise teaches: “To Abraham were the promises made and to his seed. He saith not, And to his seeds, as of many: but as of one, And to thy seed, which is Christ” (Galatians 3:16).
The true fulfillment of the promises made to Abraham is found in Christ and in those who belong to Him: “And if you be Christ’s, then are you the seed of Abraham, heirs according to the promise” (Galatians 3:29).
Abraham is therefore not the founder of a vague fraternity of monotheistic religions. He is the father of believers because he believed the promises fulfilled in Jesus Christ. Any movement that appeals to Abraham while setting aside the divinity, kingship, and universal necessity of Christ distorts the meaning of Abraham’s own faith and mission.
Contradictory Religions Cannot Be Equally True
Christianity, Judaism, and Islam do not differ merely in customs or secondary teachings. They contradict one another concerning the identity of God and the Person of Jesus Christ.
The Catholic Faith professes one God in three divine Persons: Father, Son, and Holy Ghost. It confesses Jesus Christ as true God and true Man, the eternal Son of the Father, born of the Blessed Virgin Mary, crucified for our sins, risen from the dead, and reigning as King.
Rabbinic Judaism rejects Jesus as the divine Messiah. Islam rejects the Trinity and the divine Sonship of Christ. Both also deny man’s redemption through Christ’s sacrifice, the Crucifixion, as is inerrantly taught by Christianity. These positions cannot all be true.
Our Lord Himself declared: “I am the way, and the truth, and the life. No man cometh to the Father, but by Me” (John 14:6). St. John, inspired by Holy Ghost, wrote: “Whosoever denieth the Son, the same hath not the Father. He that confesseth the Son, hath the Father also” (1 John 2:23). Yet the Beloved Apostle goes even further as he infallibly teaches: “Who is a liar, but he who denieth that Jesus is the Christ? This is antichrist, who denieth the Father, and the Son,” And elsewhere Sacred Scripture reminds us that Christ is not merely the Christian contribution to an Abrahamic religious family. He is the only-begotten Son of God and the sole Savior of mankind.
The Problem with the Modern Abrahamic Movement
The modern Abrahamic movement has taken visible form in interreligious institutions and shared religious complexes. One prominent example is the Abrahamic Family House in Abu Dhabi, which includes a church, a synagogue, and a mosque constructed as parallel houses of worship.
Peaceful coexistence is not itself objectionable. The problem is the theological symbolism created when the Holy Sacrifice of the Mass, Jewish worship, and Islamic prayer are publicly presented as equivalent expressions of man’s relationship with God.
Architecture teaches. Ceremonies teach. Religious symbols teach.
The Catholic altar is not merely one Abrahamic altar among others. Upon it, the one Sacrifice of Calvary is made sacramentally present. The Mass is the worship of the Triune God through Jesus Christ, the eternal High Priest.
It cannot be placed on the same theological level as worship that denies the Trinity or the divinity of Christ.
The same confusion appeared in the 2019 Document on Human Fraternity, which stated that “the pluralism and the diversity of religions” are willed by God.
Catholic theology requires an essential distinction.
God positively wills the true religion because He revealed it. He may permit false religions to exist because He permits human freedom, ignorance, and error. But the God of all Truth cannot, and would never, positively will contradictory doctrines about Himself.
God cannot reveal that Christ is His eternal Son while positively willing religions that reject Christ’s divine Sonship. He cannot reveal the Trinity while positively willing the denial of the Trinity. False religions may exist by God’s permissive will. They cannot be positively willed by Him as alternative roads to salvation.
The Warning of Mortalium Animos
Pope Pius XI addressed similar errors in his 1928 encyclical Mortalium Animos. He condemned religious movements based upon the belief that all religions are more or less good and praiseworthy expressions of a common religious instinct.[1]
Such movements inevitably weaken belief in revealed truth. If every religion offers a valid path to God, then Catholic dogma becomes merely one human interpretation among many. The Trinity becomes the Christian understanding of God rather than an objectively revealed mystery. The Incarnation becomes one religious story among others. The Cross becomes meaningful for Christians but unnecessary for the salvation of mankind.
Pius XI, like all his predecessors before him and the Twelve Apostles, taught that Christian unity cannot be created by religious conferences or mutual doctrinal concessions. True unity can exist only in the one Church founded by Jesus Christ.
The Church does not seek to construct a federation of religions. She calls all men to enter the one Fold of Christ.
Charity Requires the Desire for Conversion
Catholics must avoid two opposite errors.
The first is contempt or hatred for those who profess false religions. Every human being is created by God, bears His image, and is offered redemption through the Precious Blood of Christ. Catholics must treat non-Christians with justice, kindness, and genuine charity while seeking to work for their conversion.
The second error is the belief that charity requires Catholics to affirm non-Catholic religions as valid paths to God.
True charity is inseparable from truth.
A missionary does not hate a non-Christian by telling him that he needs Jesus Christ, Baptism, supernatural Faith, and the Catholic Church. On the contrary, the missionary’s willingness to labor and suffer for another’s conversion is one of the greatest expressions of supernatural love.
St. Francis Xavier did not travel to Asia merely to promote interreligious understanding. The North American Martyrs did not endure torture and death merely to appreciate indigenous spirituality. They sought the conversion and salvation of souls.
Without the conviction that the Catholic Faith is true and necessary, the missionary history of the Church becomes meaningless.
(Given the widespread acceptance of these errors among Catholics, is it no wonder that the Catholic missionary spirit has been nearly completely extinguished?)
The True Brotherhood of Mankind
Catholics affirm the natural unity of the human race. All men descend from Adam, possess the same human nature, and are subject to the same natural and divine law. But natural human brotherhood is not identical with supernatural brotherhood. Men become adopted sons of God through sanctifying grace. They are incorporated into the Mystical Body of Christ through Baptism.
St. Paul writes: “For you are all the children of God by faith, in Christ Jesus. For as many of you as have been baptized in Christ, have put on Christ” (Galatians 3:26-27).
The supernatural unity of mankind is therefore not achieved by placing contradictory religions side by side. It is achieved when men of every race and nation are united in the one Body of Christ.
The Church is truly universal. She does not belong to one people or civilization. She was sent by Christ to teach and baptize every nation. The answer to religious division is not a common religion stripped of dogma. It is the conversion of mankind to the Catholic Faith.
Fatima and the Conversion of Nations
The Message of Fatima stands in direct opposition to religious indifferentism.
Our Lady did not ask nations merely to coexist peacefully while remaining faithful to their religious errors. She called all mankind to repentance, reparation, the Rosary, and devotion to Her Immaculate Heart.
She warned that Russia would spread its errors throughout the world. She promised the conversion of Russia. Fatima is therefore a message of conversion. Our Lady desires the conversion of sinners and nations because She desires all souls to belong completely to Her divine Son.
The triumph of the Immaculate Heart will not consist in a global religious fraternity in which Christianity, Judaism, Islam, and other religions retain their contradictory beliefs. Mary always leads souls to Jesus Christ and the Catholic Religion.
Her command at Cana remains the Catholic answer to every age: “Whatsoever He shall say to you, do ye” (John 2:5).
Catholics should desire peace among peoples. We should condemn religious violence and defend innocent men from persecution. We should treat non-Catholics with respect and charity and seek to convert them. But we must never purchase temporal peace by surrendering supernatural truth.
There is one Savior, Jesus Christ. There is one divinely revealed Faith. There is one Church founded by Christ. There is one Baptism and one Sacrifice of the New Covenant.
The Catholic response to religious syncretism is not hatred but conversion. It is not coercion but evangelization. It is not the denial of human brotherhood but its supernatural fulfillment in the Mystical Body of Christ. Abraham rejoiced to see the day of Christ. His true children must do the same.
[1] Nine consecutive Popes, spanning 135 years, teach against the heresy of indifferentism, the false notion that religions other than the Catholic can bring men to salvation. Such strong opposition against any other error is unprecedented. Yet it is not just the modern Popes who teach against this heresy, but the Sacred Scriptures, the Church Fathers, and numerous saints. Here we simply cite nine papal teachings which the reader is invited to look up:
Leo XII 1823-1829 Ubi Primum #12 1824
Pius VIII 1829-1830 Traditi Humilitati #4 1829
Gregory XVI 1831-1846 Mirari Vos #13 1832
Pius IX 1846-1878 Syllabus Errorum #15-18 1864
Leo XIII 1878-1903 Humanum Genus #16 1884
Pius X 1903-1914 On the Sillon #38 1910
Benedict XV 1914-1922 Spiritus Paraclitus #38 1920
Pius XI 1922-1939 Mortalium Animos #2 1928
Pius XII 1939-1058 Humani Generis #27 1950