The real one: God, who created the universe (Genesis 1:1). The others: the rest are mere gods (small "g"), all false; all invented. Names of the falsely-worshiped gods include baal, baal-zebub, baal-berith, baal-peor, cemosh, milcom, ashtoreth, nivchaz, tartak, anamelech (and others).
See also:
How_did_polytheism_develop