Then you are old. Church-going Catholics overwhelmingly went for Bush.
The Catholic demographics were 52% Bush, 47% Kerry. Hardly an overwhelming majority. And this doesn't jibe with your assertion that 'The regligion of those who vote Democrat is mostly atheism', and with other assertions you've made.
But the Church-going Catholics vote was 56 percent to 43 percent which is pretty overwhelming especially since that vote would include Hispanics suspicious of nativists and Roosevelt babies suspicious of free-marketers.