Newer generations are realizing more and more that they don't want to waste their Sunday morning - they would rather be doing other things, they don't want to judge gay people, they are human rights people, they want to be good stewards of the planet, they are not fundamentalists like their parents and grandparents, they're simply non religious in their lives.
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"