What are you talking about? Atheists do not love themselves by the denotation of being an atheist. Atheist, meaning "a person who denies or disbelieves the existence of a supreme being or beings, holds no other associations besides its very definitions. The atheists your thinking of is the false stereotype used by the churches to cast a shadow upon any outliers. Atheists, like religious people, like anyone, have all the emotions attributed to human nature. Weddings, connotatively, are said to be religious ceremonies filled with the presence of god. But really, all marriage does is publicly profess one's love for another.