Possibly trying to convert me?

Since joining some Christian girl groups on Facebook there have been a number of girls who have reached out to be through Messenger asking about my spiritual life and inviting me to Bible study. They have all been Mormon. The Christian groups im joining are for Christians of all faiths so it’s not like I joined a Mormon group or something. I don’t believe in Mormonism because I believe they idolize a false prophet (Joseph Smith.) I don’t support that. I am kind and accepting of these people but I do not want to be apart of Mormonism and I feel like they are trying to convert me. How can I tell them I am not interested kindly?