Definition & Meaning of "Bible banger"in English

What is the origin of the term "Bible banger" and how is it used?

"Bible banger" is an English slang term that emerged in the mid-20th century, formed from "Bible" and "banger," suggesting forceful emphasis, sometimes literally pounding the Bible. It describes a fervent Christian who is aggressive or overzealous in preaching, moralizing, or promoting their faith. The term is used in informal speech, media, and social commentary, particularly in English-speaking countries, and is mildly to moderately derogatory, criticizing pushiness or zeal rather than being vulgar.