Josh Harris, author of the bestselling 1997 book I Kissed Dating Goodbye, announced on Instagram Friday that he had kissed Christianity goodbye, as well. He is also divorcing his wife. In recent years, Harris has rightly repented of his extraordinarily stringent and slightly heretical teachings in the evangelical purity movement, but he seems to have thrown the baby out with the bathwater. Ironically, the evangelical ex-pastor went from preaching one worldly dogma dressed up in Christian garb to fully embracing another worldly dogma clearly opposed to Christianity.Last week, Harris announced that he and his wife of 21 years would be separating. This is...