[Skarg]

The characters who most often took Priest or Theologian in my campaign (and in theory quite a few NPCs did) were priests and high priests and theologians and scholars.

We were pretty happy to not have system-built-in religious powers spells except/unless a GM wanted to make a specific one for some specific god in a campaign, which in our major TFT Cidri campaigns I am not sure any of us ever did (though in some later GURPS campaigns we did). One nice thing about a system leaving it up to the GM is then players & PCs need to discover what religious powers exist, if any, and/or how they work.

There were a few priests PCs and NPCs in our groups. It just wasn't a "that makes them a spellcaster" thing, which we rather preferred. If there were priests with spells of some sort, we'd expect the GM to come up with those (or not) for specific religious orders, along with whatever in-setting cosmology made sense.