Catechism number 675

Before Christ's second coming the Church must pass through a final trial that will shake the faith of many believers.⁵⁷³ The persecution that accompanies her pilgrimage on earth⁵⁷⁴ will unveil the "mystery of iniquity" in the form of a religious deception offering men an apparent solution to their problems at the price of apostasy from the truth. the supreme religious deception is that of the Antichrist, a pseudo-messianism by which man glorifies himself in place of God and of his Messiah come in the flesh.⁵⁷⁵