Goly gee, Jesus is one cool dude!
Sarcasm aside, the trouble is that the bible is actually very complex. Consider that it begins with God doing stuff, then has a whole period of time where it goes off having a bunch of people doing stuff, then Jesus comes in and tries to clear things up. There will always be a moral grey area. However, you can be sure that following the Ten Commandments, and following most of what Jesus said you will probably be fine. Fact is, there are very few instances where an important theological law wouldn't be obvious to someone with any regard for their fellow man.
I think the most obvious theme apparent in the bible is that of
Forgiveness. It is all throughout the Old Testament, and is continually reaffirmed in the New Testament. All Christians should know that people screw up, even themselves, and sometimes often too. Becoming a Christian does not make one immune to sin, just read some of the epistles... they are pretty much Paul reminding the Christians he sent those letters to that it won't be easy.
As for the whole thing about not judging, I believe that it is referring to the condemnation part, not the evaluation part. Example: I can call someone guilty of committing murder, but I cannot gauge whether or not the act was morally wrong in the eyes of God.
I am not the best Christian, but I believe in the Holy Trinity and work to improve myself according to the teachings of the bible. Is not belief and intent enough to allow someone to be called a Christian? Be honest, how often do you knowingly do something that you are absolutely sure is wrong? Mostly likely, never. Either you thought it was necessary for the greater good, or you somehow convinced yourself that your action was morally right (even if someone else would disagree). The latter is the reason for the moral compass in the Bible. If people just decided what was right and wrong themselves, we would have chaos.
The biggest trait that needs to be developed for one to be a good Christian is that of self control and reasonable kindness. The trial is coming to that point and staying there.
<!-Quote-!>Quote:Matthew 22:36-40 (NIV)
"Teacher, which is the greatest commandment in the Law?" Jesus replied: " 'Love the Lord your God with all your heart and with all your soul and with all your mind.' This is the first and greatest commandment. And the second is like it: 'Love your neighbor as yourself.' All the Law and the Prophets hang on these two commandments."<!-/Quote-!>
^^^^ That is the summary of the Bible.