I USE AUTOMATIC SUCCESS BECAUSE RELIGION AND NATURE ARE INT CHECKS AND CLERICS, DRUIDS, AND RANGERS ALL CAST WITH WISDOM.
Which is just silly.
Clerics shouldn't have to roll to recall information about religion in general, their own religion, or religions their deity is affiliated with. They should just know that shit, just like druids and rangers should just know about the flora and fauna in their favoured terrains. They shouldn't have to roll to know what monster they're facing or whether that flower is edible or not.
If they ever DID have to roll (because there's a chance they wouldn't know) I'd let them use their wisdom modifier or grant them advantage in most cases.

















