Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices.What to include in a church welcome letter. 1. Brevity: Be Concise. We welcome all who wish to become members of Corpus Christi Church. Joining our parish is more than filling out a registration form. Whether it's from the pulpit, within your bulletin or your connection. We've built a complete kit of templates to help you get started on building a comprehensive welcome packet for newcomers. Below is a sample letter for your hospitality team as they welcome new members to the church. A "thank you for joining" membership letter should include a personalized greeting to the new member.