[Salocin]

Likewise, there really isn’t original sin in Middle-Earth, or at least original sin as is in the Christian mythos

Original sin is not part of the Christian mythos. Some Christians, mainly the Roman Catholics, believe that wall humans (since Adam and Eve of cource) except Mary and Christ, are all born with this sin so they are inherently in debt. Not all Christians believe this though; the Easter Orthodox for example do not believe in this leg up. They believe that we are all born with the tendency and predesposition to sin but not with accual sin. They also do not believe that the Mother of God had an advantage over the rest of us, besides having holy parents. She was not born perfect, but attained perfection by doing Gods will. She could have sinned and turned away from God or even said no when The ArchAngel Micheal asked her to bear Christ. Many early Christian Scholars (befor 1000 A.D.;preschisim) in both the East and West held this belief as can be seen from their writings. Sorry, that was a little lengthy.

just because they were the first to awake, [elves] don’t have to suffer from all the effects of a fallen condition.

I believe they did not suffer from all the effects because of their semi-Imortality. This is because they are the First Born of Illuvaltar's children, not because they were born first. I hope you see what I'm saying.
Also, remember mortality was Eru's gift to men. He considered what they were getting where ever they go when they die better than the elves "retirement home"

Other than that I agree with Bill completely.

If you question that, your questioning a big part of the laws of physics. (For more information see Thermodynamics, study Quantum physics

On the Quantum physics bit (which happens to be one of my other passions), not all particles have a corresponding anti-particle. Lets look at photons for a moment (since every on seems to love the light analigies). It does not have an anti-particle equivalent. Neither do any elementary Bosons with the ecception of the W+ and W- vector Bosons. Also, Neutrons do not have non-Anti-Matter opposites as do the electron and the proton (positron and negatron respectively). Also, even looking at the things that are complete opposites, for some as yet unexplainable reason, there is more matter in the Universe than anti-Matter, so they are not equal.

Bills dead on with the Satan not being purely evil because than he would not exist and evil being not being. Not many people seem to realize that, Cuddos!

For the Good=Evil people: What is your deffinition of Good?