Big, interesting question about conservatives and christians.
Let's talk about words for a second. You ask if I think ALL conservatives are Christians? Why ask about ALL???? Clearly not ALL conservatives are Christians. But Christian mythology drives the TP/GOP.
I am a libertarian. But I cannot vote TP/GOP because of their dependence on 1st century mythology as a guide to public policy. Abortion and gay rights being two of the big ones, but non support of science being major reason I am a liberal. I believe in evolution and a old earth. I believe diversity of thought is a good thing.