You know that Isaac Newtown also wasn't a real Christian because he rejected the Trinity and add to that his views about Jesus and holy ghost, make him by today's standards almost a jehovah's witness, and we all know that jehovah's witnesses are not real Christians.
teachings of the Bible are so muddled and self-contradictory that it was possible for Christians to happily burn heretics alive for five long centuries. It was even possible for the most venerated patriarchs of the Church, like St. Augustine and St. Thomas Aquinas, to conclude that heretics should be tortured (Augustine) or killed outright (Aquinas). Martin Luther and John Calvin advocated the wholesale murder of heretics, apostates, Jews, and witches. - Sam Harris, "Letter To A Christian Nation"