What is Bible-thumper?
1.
(So called because some evangelists literally thump their Bibles to emphasize important parts of a sermon.)
A person whose religious beliefs include strict adherence to the Bible. He is likely to deliver angry sermons to anyone who believes differently, even if that "difference" means belonging to a church that disagrees with his interpretation of Scriptures.
DeeDee's co-workers called her a Bible-thumper after she tacked gospel tracts onto the office bulletin board.
See
2.
Me! Me! Me! Me! Me!
Man, you guys really hate Christianity don't you?