CathInfo.com

I think there's a bit of leeway regarding interpretations of Revelation/Apocalypse.  I do not believe that Antichrist is going to advertise himself:  "I am Antichrist."  People will be fooled.

When he has grown to full manhood he will publicly announce a hostile doctrine on religion.
He will lure and attract the people to himself by granting them complete exemption from the observance of all divine and ecclesiastical commandments, by forgiving them their sins and requiring
of them only their belief in his divinity. He will spurn and reject baptism and the gospel. He will open his mouth to preach contradiction. He will say, `Jesus of Nazareth is not the son of God, only a deceiver who gave himself out as God; and the Church instituted by him is only superstition'. The true Christ has come in his person. He will say, `I am the Saviour of the world'. Especially will he try to convince the Jews that he is the Messiah sent by God, and the Jews will accept him as such. His
doctrine of faith will be taken from the Jєωιѕн religion and seemingly will not differ much from the fundamental doctrine of Christianity, for he will teach that there is one God who created the world, who is omniscient and knows the thoughts of man and is just, who rewards the obeyers of his commands and the trespassers he chastises, who raises all from the dead in due time. This God has
spoken through Moses and the Prophets, therefore the precepts of the Mosaic laws are to be kept, especially circuмcision and keeping the Sabbath, yet by his moral laws he will try to reverse all order on earth. Therefore he is called in Holy Writ the `Lawless One'. He will think that he can change time
and laws. He will discard all laws, morals and religious principles, to draw the world to himself. He will grant entire freedom from the commandments of God and the Church and permit everyone to live as his passions dictate. By doing so he hopes to be acknowledged by the people as deliverer from the yoke, and as the cause of prosperity in the world. Religion he will endeavour to make convenient. He will say that you need not fast and embitter your life by renunciation, as the people of former times
did when they had no sense of God's goodness. It will suffice to love God. He will let the people feast to their heart's content so that they will pity the unfortunate people of former centuries. He will preach free love and tear asunder family ties. He will scorn everything holy, and he will ridicule all
graces of the Church with devilish mockery. He will condemn humility and foster proud and gruesome dogmas. He will tear down that which God has taught in the Old and New Testament and maintain sin and vice are not sin and vice. Briefly he will declare the road to Hell is the way to Heaven.