Bible Belt 
noun (the Bible Belt)
Those areas of the southern and middle western United States and western Canada where Protestant fundamentalism is widely practised.The born-again Baptist governor is telling voters in this Bible Belt state that their tax system is ‘immoral’ and needs repair....
- Since we're in the middle of the Bible Belt, we've been spending most of our time interviewing Christians and going to Christian churches, which are on almost every corner in many areas of the city.
- But the coach is more conservative than a Bible Belt preacher.