What is the essence of sin?
Reading the question about why eating an apple is a sin and some of its answers and comments made me think.
If eating the fruit of the tree of knowledge of good and evil in the garden of Eden was a sin just because Adam and Eve were told not to do it, that becoming the prototypical and defining act of sin, then how are we to resolve this with the general perception that certain things are sins because they are bad or evil or immoral acts.
Do all sins come down to disobedience? Are there two types of sins? Why make the original sin based on seemingly arbitrary test of obedience rather than an act of "doing something bad"? Are sins of disobeying god worse, equal, or not as bad as sins of the bad/evil/immoral type?