Ask David, a man that God describes as a man "after His own heart"
Scripture tells us that if we break one "commandment " we have broken them all
So a man that lies is an idolator, a murderer, a blasphemer , an adulterer.
When we use other men and their sins as our standard we rob God of His absolute Holiness... All sin is an abomination to God...
Yes, Salvation and all others who believe this is not possible. Humanly speaking, it probably wouldn't be. But we are speaking of God and HIS plan of salvation. So we have to see it through God's eyes, not man's.
The very fact that Christ DIED for our sins, He did not IGNORE our sins, tells us the price was more than we could ever hope to pay. And how many of our sins were future when He died for them? ALL of them. From the day we were born until the day we die. He paid for all of them. That is just the reason we care NOT to disappoint Him. If I murder someone, it's not a question if Christ has forgiven me, it's a question of if I can ever forgive MYSELF for causing Christ to suffer for my sin. And it goes to EVERY sin, not just the "big ones". They are all an affront to God. That's why He PAID for them, not overlooked them.