Because he is trying to trip you and your ideology up to make his seem supreme. At least that's the conclusion I've come to concerning this group that only likes beating this one dead hoarse into a puddle day in and day out (bad thing is it's an enemy of their own creation, at least on this site). To be honest his name isn't one of the "group" I'm speaking of, but his questions are quickly leading me to believe he is trying to protect the world from a very specific self perceived heresy, and it's all up to them to find, label, and tell the people first, what they believe, and you heard that right, the group I speak of does not need to bother asking what you believe or listen to what you tell them you believe, but they will let you know what you believe and then will destroy "your" beliefs with great prejudice, and all in the name of being a Holy protector of Gods word.
I could be wrong about him specifically because I can't say I've had him do this to me personally, plus he's been here only a week, it could be one of them, but to be fair I just recognize the pattern of questions well enough to say that this is what I believe is the point here.