I forget which podcast it was, but the coach did have an interesting backstory. Down and out, suicidal. I can see why religion would be important to him, and if he wants to pray, as long as it isn't compulsory for players to do so with him, that shouldn't be an issue.
My rural public high school had a toooooon of religious stuff throughout. I was in choir, and there were so many God songs... Granted, my home county still hasn't cracked 40% covid vaccinations last time I checked, so I digress.