I mean anything is possible, however those are two very unlikely pairings. Iran is majority Islam. Mormons believe in the christian trinity (though not the way normal christians believe in them).

Different gods, diffefent religious texts, different religious practices. They both like to oppress women in the name of god, but, so do most religions, so I doubt that’s enough to form a solid enough of a bond to convince the Mormons to attack the usa. I’m a former mormon, so one little fun fact, the usa is the mormon’s holy land. They believe the second coming is going to happen in Missouri, and they own large swaths of land there where they believe Jesus will decend.