The author of an influential evangelical book that decried modern dating as a “training ground for divorce” has himself divorced his wife and renounced his Christian faith.

Joshua Harris, author of the 1997 book “I Kissed Dating Goodbye” and a former megachurch pastor, wrote in an Instagram post Friday that he “lived in repentance” for his prior teachings in the church and in his writing. A week prior, he announced that he and his wife of 21 years had separated.