This is a pretty uneducated take, the statement may be generally true for monotheisms, but is pretty off base when it comes to the broad range of religions as a whole.

It really isn’t off base. Every belief system believes it’s correct and other conflicting ones aren’t. That’s just… how it works. It’s simply not possible for, say for example celtic paganism and Vajrayana Buddhism to both be correct. And neither of those are monotheistic

Have to disagree here. There are and were many religions that accept the existence of gods of other religions. They can absolutely exist next to each other. Those religions that seek to spread through persuasion or violence are the outliers.

Those religions that seek to spread through persuasion or violence are the outliers.

Absurd.