How do I write a letter to change my church membership? This is an almost unanswerable question without context.Ask when they started attending CHBC and how they found out about us. Ask when they attended Membership Matters and if they have any questions. Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices. If they are from another church, we write a letter to their pastor asking him to acknowledge that a person is wanting to move their membership to our church. We are so happy you have chosen to spend time at our church.