“Foundational institutions in the U.S. are under assault from the culture, further fragmenting the United States,” said Charles Holt, a rector at St. Peter’s Episcopal Church and School in Lake Mary, Fla., who spoke in opposition of the move, seeing the liturgy in contradiction to the Book of Common Prayer, which defines marriage as between a man and woman. “To change liturgies would not find acceptance in the wider church and would be an affront to unity.”