When is a Religious Belief Delusional?

[BrianSoddingBoru4]

For the Christian the beliefs are served up unquestioningly by his parents and his entire community. The beliefs are woven into how they express feelings for one another and celebrate passages and holidays.

For a long, long time, that was precisely the case in Ireland with leprechauns, brownies, banshees and the like.  In fact, when one of my grans died, we were sent out to give the news to the bees and the cows to make sure the nothing bad happened to the family after gran's death.

Could it be that when a belief or set of beliefs falls out of vogue, we are more comfortable tagging them as 'delusions'?

Boru