Simply replace the unfilled areas such as "__" and "_[date]_" with your information.
Dear _[First name(s)]_,
We are so very glad to have you with us, and would like to welcome you to our church family. Here at _[name of church]_, we always welcome new faces and look forward to getting to know you better.
We have enclosed a list of upcoming activities, which we hope you might consider taking part in. We believe in having fun and in quality fellowship, and would love for you to be a part of anything we do.
If you have any questions about our church or activities, please don't hesitate to contact the church offices.