Write a long, nasty, mean-spirited letter to explain everything that they dislike about the church and articulate their own self-pity at length. Don't be a part of influencing others to leave the church.Try to leave graciously. Disappear like it's the rapture. Communicate clearly and graciously. I recommend doing this in person, on the phone, or through a thoughtful, personal email. Here's the key: Ask this question: "Have you repented, believed on the Lord Jesus Christ, and asked Him to save you? " Don't make it more complicated than it is. Don't be a part of influencing others to leave the church. You don't want to be blamed for others making the decision to leave.