In all honesty it's not a concern. Any more. It was before a became a Christian.
You pretty much described the Christian attitude. The proper Christian attitude.
Only, as seen through the eyes of someone who hasn't yet or will never acknowledge their sinful nature.
But you're still being held in the bondage of sin. Where as, I'm not.
Like the choice of words you used. "live it up".
Why do I have to sin to live it up? Besides that, you said we don't even know what sin is. So how would you even know how to live it up?
Don't talk down to me, sir. I was a christian for 22 years, and I have a degree in religious studies with a focus on christian theology. I am as close to an expert on your religion as anyone you know.
My response to you was intended to demonstrate an awkward consequence of your position, rather than to outline my own.
The main problem with your answer is that historically, christianity has been schizophrenic on this point. Paul seemed to think that once someone has converted, they won't sin again. This is obviously not the position that the catholic church has held (I'm thinking of confession specifically) for the last 2,000 years, nor is it the position of most contemporary churches.
I think Chesterton is actually pretty close on this. It seems to me that if the point of putting humanity through the trouble and turmoil of being alive is for them to choose him freely (which is an historically legitimate viewpoint), then following the dictates of one's conscience seems to be pretty close to that.
The problem is when we want to say that something is objectively wrong. Sure, there are some general guidelines, love thy neighbor and all that, but nothing terribly specific. Abortion is a good example (but let's not get into it here.) Sure, murder is wrong, but is this really murder? There are a hundred arguments either way, and ultimately, there's no good answer.
Is the real problem that we DO want to say that things are objectively right and wrong, or at least specific things? Is this perhaps why your Lord and Saviour tells you not to judge others, because it can't be done meaningfully?