Some misguided folks actually claim that the Old Testament, and even the New Testament, taught “henotheism” — which is a form of polytheism holding that one God only is worshiped, but the existence of other gods is acknowledged. This is untrue. Monotheism (one God and one God only) is crystal clear throughout the Bible:
Exodus 8:10 (RSV). . . there is no one like the LORD our God. (cf. 1 Chr 17:20; 2 Chr 6:14)
Deuteronomy 4:35, 39 To you it was shown, that you might know that the LORD is God; there is no other besides him. . . . [39] . . . the LORD is God in heaven above and on the earth beneath; there is no other. (cf. Neh 9:6; 2 Sam 7:22; 1 Kgs 8:23; Is 43:10; 44:6, 8; 45:5-6, 14, 18, 21-22; 46:9; 47:8; Hos 13:4)
Deuteronomy 6:4 Hear, O Israel: The LORD our God is one LORD; (cf. Mk 12:29; Jas 2:19) …