When I was a teenager, I went to church, and almost every ‘Christian’ there was a complete asshole. What makes it worse is that they try to justify it. This honestly made me think that if God and Satan were real, I’d want to know Lucifer’s story. Maybe he’s not actually ‘evil.’
This is interpreted both ways. The “original” Cult of Yahweh view saw the god Yahweh as El, the head god of the Canaanite pantheon. Later, after the Cult of Yahweh became old Judaism, the comandment was reinterpreted as Yahweh being the only god jews should worship, and then later as the only God, since any other divine being worshipped by others would not be God.