Oh, certainly, parts of the Old Testament claim that other gods exist!

But that's not evidence of anything any more than Lord of the Rings is evidence of the existence of Middle Earth.

It's particularly weird to be so certain about the existence of other gods when most Christians are certain that there is only one God.

There's no evidence for the existence of any God, and so humans have created literally thousands of contradictory stories about whether there are zero, one or more than one God, what they are called, what they look like and how they behave.

Why this writer expects me or anyone to believe without any evidence his fringe beliefs not supported by any mainstream church is beyond me.