If you are a believer, your fellowship is your built-in support system. They are your family when your family can't be there. They can lead you, encourage you, serve with you and dream with you. These are substantial benefits, and I think they are taken for granted in America. It seems to me that fewer people would leave churches if they experienced life in an place like China, where meeting together is a privilege and large group teaching and worship in our own language may be a rare treat.
If you are not a believer, you miss those benefits. You don't get to worship God with a fellowship of sisters and brothers who love you, love God, and love the world. You don't get to be challenged by others to keep growing. You don't get to be part of a team that lives for something bigger than ourselves. You miss knowing the perfect Father and his imperfect family. Don't miss it! We need him, and we need each other.