i think it stands to reason that those who believe in god would also be quite persuaded to believe something as preposterous as a flat earth.
I am offended by that insinuation. What, so belief in God is equal to scatterbrained and unsubstantiated theories and insanity?
Ask all the FE'ers here. Not all (or even most) of them believe in God. Of course, there are some (go see the Flat Earth Believers forum for some examples).
Also, there was a poll, but it's disappeared. It's linked in the FAQ, though.
Also in the FAQ:
Religion
Q: "Are most or all FE's Biblical literalists, who feel like their religious belief system would be threatened by a round (i.e. spherical) earth, or are there any atheists/agnostics who are FE's as well?"
A: Not all FE's are biblical literalists. This poll has more details: Poll