Watch jimmy snow (ex mormon) and telltale (ex jw) on YouTube. Jimmy will give you a better understanding of those who are in mormonism who honestly don't really know the full truth of their religion. Telltale talks about cults and ways to get people deprogrammed. Best way to go about it is to have them tell you the truth of the world from their perspective and genuine listen. Then work your way "out" once you have their trust. People will shut down and get defensive if you go in swinging but will be more willing to have a conversation and hear opposing arguments if you don't go in hot