I can't really say that I'm the Mermaids atheist but rather an agnostic. I mean I can't say that they don't exist (so many nations around the world have these stories about human-fishes) but I don't know why I think that they don't exist. Can you tell me why you don't believe in Mermaids so maybe it becomes clear to me.
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"