The answer to this depends on who is saying it, but in general, no, this is not an insult. The "Bible Belt" refers to an area of the United States that is predominantly Christian. The "Buckle" of The Bible Belt normally refers to the states that are central to this region and is typically used to emphasize that a state is even more heavily Christian in its culture than the other states in the region.
Prong
The Dixie Bible Belt
In the USA, the common term is 'Bible belt'; states which typically belong to it are called 'Bible belt states'.
"BUCK-el" like buckle. It rhymes with knuckle.
The Bible Belt .
NO.
The Bible Belt is an informal term for a region in the south-eastern and south-central United States in which socially conservative evangelical Protestantism is a significant part of the culture and Christian church attendance across the denominations is generally higher than the nation's average.
Blasphemy
This idiom is used frequently when a social "low blow" has occurred, typically in an insult form. This is used in reply to an insult or an action which is insulting to a person on a much deeper level than the usual run-of-the-mill insults. Typically, these insults will be about family, ones mother or a girlfriend/boyfriend. As relating to the moral standard of never striking a man in the groin during the fight, the term "hit below the belt" summarizing the insult as of bad taste.
I would never insult a scholar, in the medieval period or now. I would instead insult those who chose ignorance when they have the opportunity to learn.
Those people think the term "gay" is an insult, and they're trying to insult someone. But it's not an insult, and it just make them sound stupid.
Its an insult like an idiot or stupid person