Wow! What a great discussion. Thucy, that's an extremely clear and detailed summary description of Christianity--you did a great job of it, and I'm very impressed with your ability to get right to the heart of the topic at hand. There are just two points that I have some disagreement with, which I'll come to in a bit. CA, great details too--very helpful and extremely informative.
Thucy, your post shows a much clearer understanding of Christianity than most Christians have, and I'm not criticizing your post one bit even though I disagree with two of your points. The first one is from this post of yours: "Those who do not [repent of their wrongdoing (sin) and ask forgiveness of God] are seen as contemptible because they are in essence rejecting a free gift given out of love. Imagine if a stranger died so that your best friend could be spared, and you did not even thank his family. That is how Christians view people who knowingly reject the Gospel (which is the word meaning "good news" which is their message, the message I have just described to you)."
In response, I don't know any Christians who view non-Christians as contemptible, and that would contradict Jesus' teachings that "no one is good, no, not one," meaning that Christians are no better than anyone else--just forgiven. So we're all contemptible--but we're also all loved. The Bible says "God so loved the world," not "God so loved the people who loved him back."
The second point is about Jesus being tortured by God. You wrote, "The act of the crucifixion, Christians believe, was the most painful, severe, punishment anyone has ever experienced. They believe he was not only physically tortured by the cross, but also spiritually tortured by God himself. Basically all of the punishment all people who ever lived deserved added together into one giant, awful punishment."
To a large extent I agree. The one correction I would make is that the Christians I am familiar with don't believe that God tortured Jesus, but rather that there was a heart-rending separation of Jesus from the Father, as God turned his back on Jesus because he was bearing the sins of the world.
I also want to say that I appreciate your taking the time to be so specific and also so even-handed in your approach. God bless. :-)