Islam is literally closer to Christian theology than Mormonism. As is Judaism We all agree there is one god, and no other. All very strictly monotheistic. Mormons believe in many gods. Rejects the trinity. No Christians denomination, Protestant or Catholic recognizes them as Christians that I know of. And no other accepts their ideas of God. Their prophet, holy book. Or that Jesus came back to North America and eden is in Missouri. The list goes on. Only Mormons claim they are Christians and everyone else is an apostate and wrong.
Christianity is strictly monotheistic. Its completely incompatible to polytheism. They are mutually exclusive