Let me tell you something  - my opinion doesn't matter,  not one bit. What I think about a subject or topic is inconsequential.  The only opinion that truly matters in this life is God's and He cares so much that we would know what His opinions and thoughts are, He inspired men to write an entire Bible full of them.

If you're an unbeliever, then you are not applying the righteousness of Jesus Christ as your standard for right and wrong  - therefore you are under the law - the Law of Moses - the law of sin and death, which covers every conceivable aspect of human morality (those who follow Christ are freed from the Law of Moses. They are not lawless though, they are followers of the One who gave the Law. By following Him, they are keeping the goal of the Law - which is love.

If you, oh unbeliever, smug in your own righteousness, confident you can decide what is good and what is evil, if you disagree with Him, not I, you may find yourself on the wrong side of Eternity. The Law was gives by God to allow mankind to try to be righteous and clean, sinless and perfect, through his own ability and effort. The sacrifice of Christ on tje Cross is God's declaration to all mankind  - you can't do it  - it's impossible  - NONE IS RIGHTEOUS  - no, not one - not even God's people Israel - called by His Name - all have fallen short of My glory, says the Lord. 

The Cross is God's response to our helplessness  - to our inability to stop ourselves from sinning. It is God saying "let Me help"  - it is God saying "My efforts, not yours, can save you; learn My wisdom,  My ways - I'LL be happy to teach them to you, if you'll let Me".