You can't keep snakes in your backyard and expect them only to bite your neighbors. You know, eventually those snakes are going to turn on whoever has them in the backyard.
Since Jimmy Carter, religious fundamentalists play a major role in elections. He was the first president who made a point of exhibiting himself as a born again Christian. That sparked a little light in the minds of political campaign managers: Pretend to be a religious fanatic and you can pick up a third of the vote right away. Nobody asked whether Lyndon Johnson went to church every day. Bill Clinton is probably about as religious as I am, meaning zero, but his managers made a point of making sure that every Sunday morning he was in the Baptist church singing hymns.