The Biblical story of Exodus acknowledges and affirms the existence of "other gods". It paints the plagues of Egypt not just as war on the pharaoh, but as a war on the gods of Egypt: “Against all the [man-made] gods of Egypt, I will execute judgements” (Ex. 12.12).
God mentioned their "existing", but nowhere in the Bible, does it say God "created" other gods. There is no room for another god to exist, as scripture says that God is all-powerful, all-knowing, everywhere present. He is without limits. If another God did exist, then God would be limited. However, the Bible says God has no limitations.
Men made of themselves, gods and images to worship. The bible states in any translation, that Yahweh is the only power in the universe and that even when He made Himself known to the holy men of old, they never saw His form or his face. Since mankind is a "seeing is believing" sort of race, they created for themselves "a god" and new gods, because they did not see Yahweh. [Deuteronomy 11:16-17, Deuteronomy 27:15 Deuteronomy 28:14 Judges 2:11, Ruth 1:15, I Samuel 7:3], the list goes on and on. In doing this, they gave themselves up to the curses talked about by Moses. They came to worship the creations, rather than the Creator. I Chronicles 5, talks about how the tribe of Reuben was given up into captivity for worshipping man-made gods and images, I Chronicles 5:25. This is no different than worshipping the Jewish star, the cross, the golden calf, or a picture of Jesus or the Virgin Mary. These are all images some worship, rather than the true Maker of the universe and all things in it...Yahweh.
