whoa shit we talked a lot about this at my fellowship camp
god gave man free will, he doesnt control what we do, this is where we come unstuck, the greatest sin is to not hold god as number 1 in ur life, all actions of evil come from turning away from god, every wrong descision we make doesnt hold god as number 1
to answer ur question
existence should/could be perfect, if everyone held god as number 1 and didnt sin, thats what existence was like in the beginning then adam and eve sinned
also is god perfect, yes he is he has never done anything sinful