G-Knot and Godmachine, my impression of your posts on this thread implies to me that you have a narrow view of religion and Christians in particular. Now hold on, I'm not saying this to be confrontational because I can't judge your views on this small sample, I'm just trying to be clear about our exchange.
My impression is that you have an idea about sin and you're kind of comfortable with it. And you know you don't agree with it. To me, we are all different, this is not very open-minded, and thus very hard to have a genuine trading of ideas.
I see that you're both from the US. I find it very common to both ends of extreme with people that post from there. They seem to be die hard Christians or die hard atheists having been burned by the former. GM, you say that 'it is my experience with them and I have plenty of experience in that regard' and it sounds like bad experiences, but not all Christians are like that, they aren't all irrational and judgemental, many are very humble.
If you are willing to learn, I would recommend wil, radar, and thomas that are online a lot nowadays. They have three distinct faiths and I ask them lots of questions both basic and not so basic. It's important to remember that when they use words like 'sin' and 'jesus' they are often describing different things, so don't hold the words of one against another.
Now, I'm sorry for speaking to you in such a condescending manner. I'm trying to push the conversation in a certain direction. I hope you take it well and I'm interested in how you respond to this.