Democrats and Republicans both believe in one thing: getting elected.

If professing faith in God assists them in that objective, you will find most of them doing it on frequent occasions. If not, you won't.

Canadian politicians, for instance, don't tend to talk much about their faith in God when making speeches, because it wouldn't be considered particularly relevant or appropriate by the majority of Canadians. It would strike them as a bit odd. That's not because most Canadians don't believe in God, it's because they don't believe in purposefully dragging religion into the political arena as a form of emotional pressure tactic against one's opponents. It would be seen as embarrassing and inappropriate behaviour.

And thank God for that! (grin)