If you are talking about venial sins vs mortal sins, I would shake my head. Sin is sin. We are all sinners and deserve to goto hell. That would be God's exercise of justice. You are right with your initial post.
Yet God has mercy.
What happens to those that are not written in the book of life? They are judged according to their deeds and go to hell. Different levels of hell, based on sin? A la Dante's Inferno? To think any futher is not productive. Hell bad. Don't go there. Make no provision for the flesh, seek righteousness and that which is ultimately pleasing to God.
Do not reason, and choose what sin is "worth" it which is not.
I see the sin in you is to struggle to be an arbiter of truth, or moral excellence, just as Eve saw when they ate the apple of the Tree of Knowledge of Good and Evil. That is the sin that resides in all of us, and we always try to rationalize from a human perspective examples like if Hitler accepted Christ why should he go free, if a reasonably good Jewish person that didn't accept Christ, must spend eternity in hell. Well God's standards are Holy and Just. And He is Loving and Merciful and We must trust Him in that.
Physical murder and stealing is the same in God's eyes. They both merit eternal condemnation.
If we are talking about Jesus Christ though, when he was on earth, He particularly hated the sin of hypocrisy.
And God particuarly hates the sin of pride.
Think of it this way.
Think that you are a just judge, and there was a convicted criminal that openly admitted that he murdered many people and took pleasure from it. Being a just judge could you let Him go free? Probably not... Would you sentence Him to pay a fine and do some hours of community service and have him merit His freedom? No...
How about if that convicted felon was someone you loved, like a family member. Would you let him go free, being a just judge that had to uphold the law? No...
Does it mean that you don't love that person? No...
God is the same way...
You see just because God punishes us does not negate the fact that He is loving and merciful.
God is Holy and Just and loving and merciful. If you still find it difficult to reconcile and say that sins have different degrees, it is because of the sinfulness that resides from within. Consider reading the bible in comparison to what total depravity. Though no doubt, there will be a lot of bickering in this forum you will get a better idea of what the Bible says about sin.