Dagon

Dagon was originally a fertility god, though once these beliefs adapted to Hebrews he evolved into a major northwest Semitic god, reportedly of fish and/or fishing. He was worshipped by the early Amorites and by the inhabitants of the cities of Ebla (modern Tell Mardikh, Syria) and Ugarit (modern Ras Shamra, Syria) (which was an ancient city near the Mediterranean containing a large variety of ancient writings and pagan shrines). He was also a major member, or perhaps head, of the pantheon of the Biblical Philistines.

Dagon in "Occupation Duty"
Dagon was the principle god of the Philistines. While believers, most modern Philistines were not ardently religious the way their Moabite neighbours were with their principle god Chemosh.

Moabites denied Dagon was a god at all. Some claimed that Dagon was a demon while others denied he existed at all. This infuriated even non-believing Philistines.