Write a long, nasty, mean-spirited letter to explain everything that they dislike about the church and articulate their own self-pity at length. Share honestly but graciously why your family chose to leave and why you are excited about becoming part of this new church family.Customizing your Leaving a Church Letter is easy with Jotform Sign. Dear Chairman Board of Elders,. I am writing to withdraw my membership from Grace Community Church. 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. More exact depiction than Hennepin's "great Out-let.