You are attempting to suggest that God's laws are not objective (applicable in all places and at all times). By saying there is no right or wrong, you are saying that all right and wrong is purely subjective and that depending who is in power, you could be right today and wrong tomorrow. God's grace will not save people in their sins; but only from their sins. If you believe that God will save everyone no matter what they do in mortality, I think will are sadly mistaken. If, on the other hand you believe that God will save you for simply verbally confessing His name, you are mistaken. For He says that not everyone that says Lord, Lord will enter the Kingdom of Heaven. If you think it is by grace alone without any effort towards repentance on your part, you are mistaken.
James 2:17-20:
17 Even so faith, if it hath not works, is dead, being alone.
18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
19 Thou believest that there is one God; thou doest well: the devils also believe, and tremble.
20 But wilt thou know, O vain man, that faith without works is dead?
Do you think God is a partial God? That He will save some and not others capriciously? That there is no criterion for His judgments? His law is just a eternal as He is and it is by His law that He judges. And the thing that He judges is sin. And the activities declared as sinful are declared in scripture.