Does Christian's 2 day WHC reign prove that Vince McMahon doesn't have faith in him?

Yes and No. Vince doesn't think christain can carry Smackdown as world heavyweight champion that's why Randy Orton was drafted to Smackdown to be the top face. I don't think Vince want Christain to be champion yet maybe it could be more of a bigger storyline i hope he turns heel soon and become champion again he's better as a heel.