Does the Bible deny the existence of pagan gods or just forbid the worship of them?
No, the Bible does not deny the “existence” of such pagan gods, but it identifies them as being false Gods. The psalmist sang: “The idols of the nations are silver and gold, the work of the hands of earthling man. A mouth they have, but they can speak nothing; eyes they have, but they can see nothing; ears they have, but they can give ear to nothing. Also there exists no spirit in their mouth.” Indeed, they are gods who “cannot save.”—Psalm 135:15-17; Isaiah 45:20.