I live in the south in the middle of the Bible Belt and doubt very seriously that it would be a problem. Granted this is all anecdotal but pretty much any answer on this topic will be:
1. Most developer positions are in the bigger cities which are much more cosmopolitan than the rural areas. Most of the people I've worked for and with were from the west coast, up north or Florida.
2. While I have met a few fundamentalists in my career its pretty rare. There ain't a lot of "snake-handlers" doing OO programming.
3. The Christians I have worked for have been very open about hiring. They wanted people who could do the job regardless. The only requirement was that their personal beliefs didn't get in the way of doing the job and cause contention at the office. I've not seen a problem yet.
4. Most of the people I know who live in sticks (a lot of my family included) and would be considered "fundies" just because of their association with the Bible Belt would find you interesting and would probably invite you to their weekly poker night.
5. I think you would have just as much trouble finding a job in the south after working for a gambling concern as you would in the north after working for the Southern Baptist Convention.