>>3782953I think altars can identify if they're the same alignment as your god, and there's the Lore skill, but if I recall right that's a one-time chance on pickup to identify the item. But of course using the altar burns piety and, as you noticed, it's kind of a tricky balancing act.
I would just carry on and let it be in that regard, all the gods are a pain in the ass to please except three, and that's only if you play a caster (Celeste, Trickster and Shiver give piety for learning spells).
If you really need more, it'll take the Religion skill and sacrificing like a motherfucker. But you know, spaced out, I recall a cooldown on that.