Is all outside of marriage(not adultery)against the spirt of the triune god?

i don't believe with that guy above me, there is a god. but its not a triune god. The trinity is a false doctrine. If you don't believe me then read the bible. No where is trinity ever mentioned nor is it reffered to. there is one God, one Son, and one holy spirit (holy ghost) they are seperate from each other. But if you believe what the bible says then Yes any sort of ual outside of marriage is a sin.