In the case of the cosmos, [...] even if we don't understand how it came about, it's not helpful to postulate a creator, because the creator is the very kind of thing that needs an explanation - and although it's difficult enough to explain how a very simple origin of the universe came into being - how matter and energy, how one or two physical constants came into existence - although it's difficult enough to think how simplicity came into existence, it's a hell of a lot harder to think how something as complicated as a God comes into existence - difficult enough to think of how a deist God comes into existence, and even more difficult to think of - how a Christian God, who actually cares about things like sin and gets Himself born of a virgin.