When is a Religious Belief Delusional?

[robvalue]

Oh sure, I bet religion can push someone towards mental illness.

I think the biggest practical problem is diagnosing mental illness, when the kind of things religious people say can sound very similar to genuine symptoms. Such things can even be encouraged among the religious. I'm sure people end up saying things they think people around them want to hear, and perhaps end up convincing themselves that they are really true.