There is a big religious and a big secular population. The secular population does not punish politicians at the ballot box for talking god, the religious population does punish politicians at the ballot box for talking god, so politicians by and large talk god unless they are in a position where the hit at the ballot box doesn't hurt.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.