What is stopping atheists from marrying farm animals?

how 'bout our loose promiscuous male population? if morality is objective why does the bible condone slavery--it say I can own 2, Atheist and meaningless are not synonyms, and then there is copious, neurotic free floating guilt which is the hallmark of the Judeo-Christian tradition, with out it you could not pressure anyone to do anything, shall we proceed to genocide, war, torture, and global cultural destruction?