Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices.Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. 1. Enter the date at the top of the letter. These templates of welcome messages for church visitors. Use them in letters, connection cards, your bulletins and your welcome packets. I am happy to be able to inform you that on Tuesday, Nov. 24 the Church Board officially accepted you into Membership here at First Christian Church. The Roman Catholic Diocese of Sacramento serves 20 counties of northern California. A "thank you for joining" membership letter should include a personalized greeting to the new member.