Antichrist Will Be A False Convert To The Catholic Faith Just Like Some Protestant Converts To Catholicism Are Today

Antichrist (figure on the left, with the attributes of a king) by Herrad von Landsberg (about 1180), Hortus Deliciarum – 12th century Source

“The earth will be struck by calamities of all kinds (in addition to plague and famine which will be wide-spread). There will be a series of wars until the last war, which will then be fought by the ten Kings of the Antichrist, all of whom will have one and the same plan and will be the only rulers of the world. Our Lady of La Salette 19 Sept. 1846 (Published by Mélanie 1879)

It will be during this time that the Antichrist will be born of a Hebrew nun, a false virgin who will communicate with the old serpent, the master of impurity, his father will be B. At birth, he will spew out blasphemy; he will have teeth, in a word; he will be the devil incarnate. He will scream horribly, he will perform wonders; he will feed on nothing but impurity. He will have brothers who, although not devils incarnate like him, will be children of evil. At the age of twelve, they will draw attention upon themselves by the gallant victories they will have won; soon they will each lead armies, aided by the legions of hell. Our Lady of La Salette 19 Sept. 1846 (Published by Mélanie 1879)

“Rome will lose the faith and become the seat of the Antichrist. Our Lady of La Salette 19 Sept. 1846 (Published by Mélanie 1879)

“The demons of the air together with the Antichrist will perform great wonders on earth and in the atmosphere, and men will become more and more perverted. God will take care of His faithful servants and men of good will. The Gospel will be preached everywhere, and all peoples of all nations will get to know the truth. Our Lady of La Salette 19 Sept. 1846 (Published by Mélanie 1879)

This is easy. 

Most converts to the Catholic faith carry their protestant baggage with them into the Church.

These are false converts.

Just like the Antichrist will be one day.

The Antichrist will be born of a false virgin.

The Antichrist will come from the Tribe of Dan.

The Antichrist will be circumcised 

The Antichrist will be brought up in the Jewish faith.

Then the Antichrist will CONVERT to the Catholic Faith.

This will be a false conversion.

The Antichrist will gain a kingdom by fraud and deceit 

This kingdom will be a Catholic Kingdom and this Kingdom will be ruled by a Catholic Ruler.

This is how the Antichrist will gain this Catholic Kingdom - claiming he is a Roman Catholic.

The Antichrist will (for a time) be a false convert to the Catholic Faith

Once the Antichrist gains his kingdom he apostatize from the Catholic Faith and will revert to Judaism  he will then declare war on the ten kings that have a share in the Roman Empire.

No Church Father had said that the Antichrist will be a false convert to the Catholic Faith. This is my take on his deceit and fraud in order to gain a Catholic Kingdom.

This is what it means to gain a kingdom by fraud and deceit - to be a false convert.

I also believe that the forerunner to the Antichrist will be a False Convert to the Catholic Faith in order to gain a "kingdom" or Nationalist Army.

Just like Our Lady said:

A forerunner of the Antichrist, with his troops gathered from several nations, will fight against the true Christ, the only Saviour of the world. He will shed much blood and will want to annihilate the worship of God to make himself be looked upon as a God. Our Lady of La Salette 19 Sept. 1846 (Published by Mélanie 1879)