Google is your friend.
You don't even need Google. Just check the political threads here. You'd find enough evidence of folks ridiculing the religiousness of Republicans.
The notion that this is some debatable point is silly.
Just Googled religious groups according to political affiliation. Here's just the Christian groups:
Catholic: 44% / 37% in favour of Dems
Mainline Protestant: 44% / 40% in favour of Reps
Black Protestant: 80% / 10% in favour of Dems
Orthadox Christian: 44% / 34% in favour of Dems
Jehovah's Witness: 18% / 7% in favour of Dems (but 75% no affiliation)
Evangelical Protestant: 56% / 28% in favour of Reps
Mormon: 70% / 19% in favour of Reps
Of course every non-Christian religion is overwhelmingly Democrat as well. Republicans are more likely to claim to be religious, claim that religion is important in their life, and claim to attend a religious service every week (although Christopher Hitchens had the line that if you added up the number of people who claimed to go to church once a week, there wouldn't be enough room in all the churches to fit them in).
When we talk about religion in politics, what we're not actually talking about is belief, but the desire or willingness to use politics to impose that belief on everyone else. Considering religion a private, personal thing does not make you less religious than someone who relishes any opportunity to bang on about it and use it to tell you how to vote.