Life does not begin at the fertilization of an egg. It has not even implanted yet. It is just a collection of cells.
So are you, imasheilatoo; just a collection of cells that happen to think they have rights. Not sure why your particuar collection of cells think that, but I guess they do.
Implantation. An egg can be fertilized by a sperm but unless it successfully implants into the lining of the uterus it won't continue on it's journey towards birth.
Let me know if you get tired of playing this game: First grade is when it moves from non-life to life, because if a child doesn't make it to first grade, he won't continue on his journey toward real life.
How can those who oppose all abortion defend the position that a zygote has the same value as a new-born?
Well, I guess it is because newborns derive their value, if we may use the term, from the simple fact that they are human beings. If you'd care to define a human being in some coherent way that excludes zygotes and includes newborns, comatose people, and forgotten homeless people, then I would like to hear it.