Do you realize that many of the nominally Catholic immigrants are converting to evangelical Protestantism? They are swelling the ranks of the new mega churches. The mega church to which I used to belong (before I converted) started as a predominantly white church with some black members; now it’s jammed with Hispanics, to such an extent that there are Saturday and Sunday traffic jams and the church has constructed larger and larger new buildings, whose capacity is constantly outstripped by the growth in membership.
Yes I am aware that many Hispanic Catholics leave that denomination to join a Protestant denomination, and those are in play for the pro-life republicans.
Tis true...What these Catholics apparently don't realize is that their religion is not growing...These additional numbers are just transplant illegal Catholics from Mexico...They not only will bleed the U.S. taxpayers dry, they'll drain the U.S. Catholic religion dry...
And like you said, many of these illegals are moving to non Catholic churches but there is still enough of a net increase in the Catholic religion that it's a positive on their membership books...