Man is a religious animal

Man is the religious animal.
He is the only religious animal.
He is the only animal that has the True Religion -— several of them.
He is the only animal that loves his neighbor as himself
and then cuts his neighbor's throat, if his theology isn't straight.
He has made a graveyard of the globe
while trying his honest best to smooth his brother's path to happiness and heaven.
~ Mark Twain