[graemep]

The guidelines say:

"Off-Topic: Most stories about politics, or crime, or sports, or celebrities, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic. "

No mention of religion there, and it says "most politics" not all politics.

"Anything that good hackers would find interesting" and it seems reasonable for that to include philosophy, religion etc. and definitely an interesting web app is of interest.