Mangasar Magurditch Mangasarian was an American rationalist and secularist of Armenian descent. Mangasarian considered himself a Rationalist or a Secularist not an Atheist, since he considered atheism a non-verifiable belief system. He was pastor at a Presbyterian church in Philadelphia, which he resigned from, becoming an independent preacher and a lecturer on "independent religion" in New YorkAbout Jesus — Is He a Myth? deals with the evidence against the existence of an historical Jesus.