This post actually helped me process something that happened 20 years ago. I said to a fellow student at uni "good luck". He snapped back severely "I don't believe in in luck, I believe in God!" and I just stood slack jawed unsure what I had said to offend. Bizarre.
Yes, these people make their entire religion their identity, and react accordingly.
The recent batch of radical identitarians on the left make their ideology into a religion, make that religion into their identity, and react accordingly.
They are slightly different approaches that reach the same end: Intolerant, miserable human beings who can't help but contaminate every social interaction with intolerance.