Why Christians should be outraged by Erdogan’s Hagia Sophia orderBy Timothy Head, Op-ed contributor CommentThe imposing structure of Hagia Sophia, located in Istanbul, Turkey. The building began as an Orthodox Christian cathedral, was converted to a mosque in the 15th century, and was then made into a museum in the 1930s. | (Photo: Arild Vågen/ Wikimedia Commons)Timothy Head is the executive director of the Faith and Freedom Coalition.