it's just that religiosity is correlated with a bundle of factors that tend to imply conservatism, and that church events give you a ready-made venue for talking to other conservatives.
That is probably an important contributor to the phenomenon; there is a certain "social conservative" mindset. However, I think that religion leads to some social norms, such as the idea that it's acceptable to pick one's morality out of old books, which provide fuel to socially conservative movements and attitudes.
I periodically get email from folks who, having read "Accelerando", assume I am some kind of fire-breathing extropian zealot who believes in the imminence of the singularity, the uploading of the libertarians, and the rapture of the nerds. I find this mildly distressing, and so I think it's time to set the record straight and say what I really think.
Short version: Santa Claus doesn't exist.
- Charles Stross, Three arguments against the singularity, 2011-06-22
EDITED TO ADD: don't get your hopes up, this is pretty weak stuff.