I don’t see the takeover as military action but (for lack of a better word) philosophical.
They’re going to chip away at its policies by appealing to ecumenicalism. We’re all God’s children and stuff.
Unfortunately for Catholics, the C CC put out by Vatican 2 already pays homage to muslims.
Vatican II ended in 1965. The Catechism of the Catholic Church was promulgated in 1992.
No philosophy required; the issue is biological. How far below replacement is the Italian birthrate these days?
People ignored and laughed at the Popes over birth control, but they were stating the simple truth. Birth control and loose sex leads to the extinction of nations. The process is already far advanced.