The Old Testament does makes it fairly clear that there are other gods, because it started as a polytheistic religion, Jehovah is just supposed to be your favorite (or he’ll kill you).
It’s the modern interpretations that decided to interpret that as monotheism, but that includes Christianity.
There’s no evidence for your claim. And the old testament does not. Yes, it refers to other gods as concepts but not as literal Gods
The first commandment is literally “you shall have no other gods before me.” If you look at different historical translations and viewpoints, it is well accepted that Judaism experienced a shift from polytheism to monotheism, and there is more evidence of that in the Old Testament. Passages referring to Yahwehs wife, waging war to defeat other gods, etc.
It’s talking about concepts, and the false gods existing as a concept. You could even have something like money, etc, be your god. What’s your source on “Yahweh’s wife” apart from the Church itself being His bride? (Which still doesn’t make the Church a god)
Their claim does have support in so far that the early testament contains a lot of work written by polytheistic people that later in would become the monolatrists and even later monotheists that we know as Jews, further branching off into what today are Christians.
This does not mean that Christians in any sense are not purely monotheistic. Not only are they so, it’s one of the most critical parts of their beliefs, to the point where even believing that their one god has in any way shape or form some kind of tangible division is considered strict heresy from trinitarian churches which form the mainstream of Christianity and have done so for hundreds of years.
Edit: There is a great video by Alex O’Connor interviewing Esoterica on that topic in particular and they talk about the evidence that supports the viewpoints.
