Pray on it. There's also videos of the sermons for him to watch. But thousands of people are brought together there every weekend for a reason. Just ask him to have faith and at least try it out for a couple of Sundays.
Ask him to have an open mind and sit as close to the front as you can! Also stop and talk with the people serving at the church, they are so kind and give such a warm welcome. May God Bless you and your family
I just know that it was Celebration Church who helped feed my family and I This past Thanksgiving.
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