The Christian Catholic Apostolic Church was the focal point of the community of Zion, Illinois in the early 20th Century. The church, headed by John Alexander Dowie and later by Wilbur Glenn Voliva was probably the largest church in the United States teaching Flat Earth doctrine at the time. The church went into decline following Voliva's death and was later was renamed the Christ Community Church. It is currently a Protestant Evangelical church serving roughly 1100 people. A detailed history of the church is provided on their website.