The only problem with your circumcision explanation is that it still limits this supposedly limitless God. If God can only recognize those of the circumcision, then how does he recognize "Satan" or the Pharoah?
Concerning Lot, I like what you have to say about the Deus Incognito motif, but the hospitality question separates from the question when the virgin surrender enters. God enters the scene in disguise in several places; in fact, Jesus does it, too, but no one offers God or Jesus virgins.
As for the Satan discussion, I've got more to talk about on that later. There's some rather significant textaual evidence that supports Lucifer as a king--not Satan. The idea that Satan is a fallen angel only works if Lucifer is Satan, but that all depends on the theory that he fell in a major war in heaven. In that myth, Satan was actually the worship leader in heaven. Interesting stuff that I hope to present on later.
