Remember, we must use love (and get to the hard truths once we earned their trust), because otherwise we come off as religious fanatics (think about the person who goes around saying repent or you'll be sent to he**). Even if it's true, it rarely encourages people to come to Christ and even if the person does, they usually end us as the seed choked by thorns or growing in difficult soil, so they abandon the faith not long after.
If you look at mormonism, which is actually more satanic than Islam because it is based on believeable truths, it has the same backstory, an angel (one that isn't mentioned in the bible to my knowledge) appearing to a more modern prophet in the mid 1800s. For catholics who are obsessed with rigid discipline, its an effective honeytrap
However, they have the worker obsession and apparently marriage between mormons is very destructive (they take the women submitting to men beyond how it's intended from Paul's letter), and some even promote or encourage polygamy (which wouldn't be a bad thing if men had proper self-control but that's impossible without the holy spirit). Problem is this cult misrepresents Jesus (and they often commit the one unforgiveable sin mentioned in the bible, a hardened heart that doesn't want to follow G**, but deceives others into believing they do, because Christians are full of hypocrites not doing what we are called to do)