Without expressing my viewpoint, I happen to think the logic used by Xander (nothing personal dear friend) is flawed.
You tried to make an argument that just because a sperm cell and an egg unite....whats the big deal? What the difference between them after vs. before....
If we are to use your logic...and say NOTHING...then the answer stays nothing and we should be able to kill anyone because it is an arbitrary decision from that point forwards, isn't it?
Some would say after 3 months.....then no abortion. Why? And how can you generalize in this manner? Some "babies" mature at different rates than others...
All the arguments on both sides of the debate are useless. They will never be resolved to the satisfaction of either side since each side has totally different (note I said different not opposing) viewpoints.
Why not argue about euthanasia instead?