One of the ways you can tell a healthy church from an unhealthy one is the way they treat people who leave or want to leave. In a healthy group, almost everyone will recognize that theirs is not the only church, or the only true church, or even the only decent church, and the really healthy ones will realize that theirs is not even the best choice for many people. They recognize that you can come and visit or join and participate for as long as it makes sense for you and your family, and when you judge that you need to move on, they will bless you and wish you well and tell you how much they'll miss you (in the good kind of loving way, not in the cultic guilt-trip kind of way.)
Click above to learn more. I wish I could put into words what I've seen and been through that well.