People divorce for a lot of reasons. Most are probably valid — abuse, infidelity, finances, insanity, extraterrestrial-ism, whatever.
Having a partner cheat on you is bad enough. But discovering your spouse is a night-roaming cephalopod would strain just about any relationship.
There are also stupid reasons to divorce. I won’t go into all of them, just what I consider the most idiotic.
Keep in mind that I mean relatively benign religions. If your spouse insists on converting to a faith that believes in a sacrament of chewing the heads off rats, or appeasing some malevolent god by tossing virgins into a volcano, grab the kids and run.