It occurs to me that there is very little that all non-Christians, or indeed all members of any group, would agree on. It depends on what your value of "all" happens to be.

Speaking from only my own perspective, though, I've never known someone to disregard Christianity or any other religion for a reason as obviously logically flawed as this one. Most of them can't reconcile the Bible's characterization of God with their own idea of moral perfection, and most of the rest can't be bothered with letting anyone else tell them how they ought to live their life.