One of the hypotheses Leareth has considered for how to square the supposedly truly-omnipotent God of Lev's world with the powerful-but-far-from-omnipotent gods of his own world is that they have some sort of subsidiary relationship. He wishes he could think of a way to test this. If Lev's God created his world, then in a technical sense his powers probably do come from that God, just at the end of a long chain of cause-and-effect encompassing the entire world-history. Overall, though, he still thinks that Lev's God behaves in very confusing ways for a genuinely omnipotent being, and the simplest answer is that He isn't.
Leareth is still annoyed about pride supposedly being a vice according to this God's ontology. He thinks pride is a valuable human quality, thank you (a dozen examples of various clever and interesting scholars he's known very quickly flash to mind).
Leareth isn't sure that his world has a Creator god; it's possible, it's even possible that said god is one of the existing pantheon, but if so they don't advertise it. The religion practiced under Vkandis Sunlord in Karse might be the only one he knows of that claims their god literally created the world as opposed to just inhabiting it as a divine being. Personally he thinks that probably Vkandis didn't create the world; He doesn't seem any more powerful than neighbouring gods.
Leareth's past questionable decisions include trying to act as advisor to the King in an ancient empire, making some clumsy attempts at consequentialist policy (he was young, okay), and drawing enough attention to himself that his own childhood teacher, afraid that he's making a power grab, starts a war against him. Further poor choices include not immediately de-escalating, although to be fair he didn't know at the time that said previous teacher had weapons of mass destruction. Weapons of mass destruction go off, there's an apocalypse that...isn't accidental, exactly, but no one involved meant for it to be as bad as it was. Leareth survives because he's immortal. His teacher doesn't. He's still pretty miffed at reality over that part.
Leareth has done a lot of research into the afterlife! This is relevant because (a block in his thoughts, steering back to the main topic). It seems to be different under the reign of different gods, but the general outline is that spirits leave the bodies of the deceased and end up in the spirit plane, where they float around for a while before being sent back, 'reincarnated' and attached to new bodies. The spirits themselves aren't precisely people. Missing a brain, they don't have most of the components necessary for thinking or true sentience. They can probably have basic experiences of a sort, so they could be tortured if a god wanted, but based on his attempts to research something so difficult to test, being dead is mostly a peaceful, restful, and boring experience.
Leareth is extremely curious what would happen if someone tried to expel him from his body! Mostly because he's been hankering after any glimpse of magic in this world in order to figure out how it works, but also because (another block in his thoughts). It's too bad that maybe Asher can't do it, although he's confused because he thought the salvation thing was binary. Also, he's irritated again that this God wants to declare normal human sexuality a sin, it's so...pointless...compared to more important things like murder or the fact that no one does anything about children starving as long as it's happening far away, although to be fair he hasn't checked and maybe that's different in Lev and Asher's world and people just are more virtuous than in his. Then again, he's pretty sure the Gileadite government is constantly committing things that really ought to be sins, so...take that back.