The bible belt runs about 150 miles either side of a curve starting in Dallas, over to Shreveport and Monroe, La to Jackson, Miss over to Birmingham, Al to Atlanta and curving up to Va. I think probablya little north of this.

I can't speak for the "northern" states, but I would love to see someone propose no sunday hunting in Texas, Louisiana, Arkansas, Mississippi or Alabama!

This, in my humble opinion has little to do anymore with the bible belt. Blue laws and other sunday restrictions have pretty much evaporated in almost every other way, why would hunting be any different? I serously doubt that there is and political group actually lobbying to keep the law in place.
Virtually every argument I have ever heard against sunday hunting have either been from farmers, anti hunters or some other group and not based on any real religious reason.
Hank