Write a long, nasty, mean-spirited letter to explain everything that they dislike about the church and articulate their own self-pity at length. It's important to assess and communicate underlying issues biblically, accurately, and respectfully before leaving.Keep your former church in your prayers and speak well of it. Pastor Jim is an awesome speaker. If people are gracious enough to let me know they are leaving, I write them a letter and thank them for their attendance and past service.