The relative definitions of "right" and "wrong" from those who choose not to believe in a deity or choose to define creator as superior-intellectual aliens or as some abstract fluid and distant entity far removed from everyday life, naturally recoil at the biblical references to sin.
Sin is a dirty word. Personal. Antagonistic. Prejudicial. Restrictive. And no one wants to admit to it.
One person's "wrong" is just another person's "right". We're seeing this more and more as some collegiate professorial types are now calling pedophilia just another sexual persuasion not unlike hetero/homo-sexuality. Certainly not "sin".
As a full-fledged sinner type, I can testify as to what the hell is wrong with sin. First off, it's hell-ish. If behavior goes unchecked, the nature of mankind is to corrupt whatever he chooses to do. Without some restrictions as to what's acceptable and upright, murder, mayhem, and misery prevail. If this wasn't the case, utopia would've arrived by now. Clearly, it has not. Ever more clearly is the disintegration, rebellion, and repetition of heinous behaviors from mankind manifesting themselves in the gruesome and barbaric live murders of full-term babies, the perversions of beastiality still present, pornography of all types on the rise, homosexuality and transgender supplications lauded, and the direct evidence of lying, cheating, and even murder from the higher-ups in government. This world is full of sin. And it isn't pretty. And rather than deteriorating in the amount of demonstrated conduct, it's on the rise.
The underlying problem with sin is that much of it is accompanied by a little fun or a lot of fun. When you inject entertainment into the mix of right and wrong, suddenly there are innumerable excuses as to why sin "isn't so bad". The human flesh loves to experience gratification of many - perhaps any - kinds and will propel us forward into doing things we sense are not particularly good for us in the long term. But, boy, that short term thrill can justify the moment. At least until the remorse sets in to those whose consciences are not yet seared.
Conscience in and of itself can provide reasonable arguments for not doing something which can be harmful to us or others and can establish a distinct right and wrong. The problem with conscience is it can be influenced by the effects of sin. If you betray your conscience enough times, repeatedly, it disappears as a warning label and provides no strong objections to the bad behaviors and consequential choices. And if the consequences seem minimal - which really they rarely are - there's all the more reason to rationalize what you've done. You develop a resistance to the severity of the outcomes because of your desire to continue certain behaviors. Sin is definitely addictive.
The final example of a life of sin is the one displayed on your face, tattooed in your eyes. You might not look like a meth-head in physical appearance (which really is a picture of a life given over to sin), you might be beautiful or handsome in physical stature, but there is one detail you cannot prevent if sin is your lifestyle of choice: hardness. It will scream its presence from your eyes, your expressions, your attitudes, your general countenance. It cannot be disguised or hidden. In fact, it will eventually become blatant. Its level of decadence will be worn as skin, your flesh. Unrecognizable to others of like-minded living and even to you when studying your image in the mirror, you cannot be separated from it by your own doing.
And once you embrace sin, indulging it as a chosen companion, the cure for your woes becomes a distant vision, unclear and blurred. It's still there in its brilliance, but you can't see it well even in moments when you try. You begin to wonder if it was ever real.
So. These are "WTH is wrong with sin?!"
Romans 6:23
Father, you delivered me from my life of sin and you took the hardness and washed it away with the Blood of the Lamb. There are no words good enough to explain the Glory. In the Name of Jesus, Amen.