Bible belt

Bible belt idiom
An area noted for religious fundamentalism; specifically, parts of the American South and Midwest. For example, You wouldn't dare try to sell a sex manual in the Bible belt. This term alludes to the prevalence of evangelical revivals, strict morals, belief in the literal truth of the Bible, and similar traits. [c. 1920]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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