I don't understand why you think that "something" must be sentient and not just a process like all the other natural processes we observe. Your leap of faith isn't just to "something caused the Universe", it's to "something caused the Universe and it was a personal God". Another problem is that religious people go from "everything must have an origin" to "everything must have an origin and therefore everything in my religion is correct".
Going back to rationality, surely you can see the reason in "X did Y!" "Oh yeah? Prove it."
@Solitarius, not going to dignify that non-sequitur ramble with a response.