According to Christian News Network:
In a new video, megachurch leader and author Rick Warren is calling for Christians to unite with Roman Catholics and “Pope Francis,” who Warren recently referred to as the “Holy Father”—a move that is raising concerns among Christians nationwide and is resulting in calls for Warren to repent.
Warren made the comments following his visit to the Vatican last month, where he spoke at an interfaith conference on the “Complementarity of Man and Woman.”