MAN IS A RELIGIOUS ANIMAL

MAN IS THE ONLY ANIMAL THAT LOVES HIS NEIGHBOR AS HIMSELF AND CUTS HIS THROAT IF HIS THEOLOGY ISN’T STRAIGHT

Mark Twain frequently spoke about religion. Even though he was raised a Presbyterian, as a humorist, he understood just how serious, deadly and unforgiving religion – all religions - could be:
“Man is a religious animal. He is the only religious animal. He is the only animal that has the true religion – several of them,” Twain wrote in ”Following The Equator”.

http://www.gutenberg.org/ebooks/2895

And in ”The Lowest Animal” he wrote:
“He is the only animal that loves his neighbor as himself and cuts his throat if his theology isn’t straight. He has made a graveyard of the globe in trying his honest best to smooth his brother’s path to happiness and heaven.”

http://grammar.about.com/od/classicessays/a/The-Lowest-Animal-By-Mark-Twain.htm