" Incorrect.
You have made this assertion without a shred of evidence.
In point of fact, attendance at Mass in Italy dropped some 40% in Italy between 1880-1940. During this period, for the first time, millions of children were not even baptized."
"Evidence"?? Try any history book, or book about Italy.
Btw, non-worshipping attendance does not necessarily mean one is no longer Catholic. Or Baptist. Or Jewish.
Joining an anti-Catholic organization like the Communists or Fascists and ceasing all participation in the Church makes you no longer a Catholic.
I don't see how one can join an organization which says that God does not exist, or an organization which says that man's sole responsibility is to the State and still be said to have membership in or allegiance to a Church which requires its members to believe the exact opposite of those two principles.
Any? How about this - cite one serious, scholarly book to support your thesis.