According to Wikipedia, he belongs to the Christian Reformed Church of North America.
Brown and his family worship at New England Chapel in Franklin, a member of the Christian Reformed Church in North America. They also have a relationship with an order of Cistercian Roman Catholic nuns at Mt. St. Mary’s Abbey in Wrentham. The Brown family has raised over $5 million for the order, helping to install solar panels, a wind turbine and a candy manufacturing plant that the order operates. Sister Katie McNamara has said of the family, "[w]e pray for them every day".