Firstly, why should a legislature be voting on a medical definition, or for that matter, a Biblical definition. If people believe literally in the Bible, then they can get their definitions from the Bible; they don't need to have the legislature vote on it. If they don't believe in the Bible, then it's not the legislature's job to make them do so.
Secondly, from a medical point of view, we run into all sorts of difficulties when we state that life begins at the moment of fertilization. It is more accurate to say that life, or at least its potential, *sometimes* begins at fertilization. Some fertilized eggs have genetic or chromosomal defects that prevent any sort of further development. Others fail to implant for a variety of reasons. While survival to term is rather uncertain even after implantation, the medical evidence suggests that the *majority* of pre-implantation embryos don't survive to birth. In practice, people usually think of conception as including implantation as well as fertilization, or you'd have to say that the majority of pregnancies end in miscarriage.
Thirdly, it is not at all clear that the Bible says anything that clearly defines when life begins. Here are some Bible quotes from a 'pro-life' religious site;
http://www.godandscience.org/doctrine/prolife.htmlThus they are probably the most convincing quotes that the site-owner, Rich Deem, can come up with. They include:
'And if men struggle with each other and strike a woman with child so that she has a miscarriage, yet there is no further injury, he shall surely be fined as the woman's husband may demand of him; and he shall pay as the judges decide. But if there is any further injury, then you shall appoint as a penalty life for life." (Exodus 21:22-23)
Therefore, the law tells us that a man who induces an abortion or miscarriage is to be punished, indicating that God values life before birth. A verse from Hosea3 says that abortion is a punishment for sin, indicating God views it as bad. Likewise, God expressed His disgust for the Ammonites, who "ripped open the pregnant women of Gilead".'
But all of these involve causing an unwanted miscarriage, typically by injuring or even murdering the woman. Moreover, the first quote seems to me to go *against* the view that an unborn baby has the same right to life as someone who is already born, since inducing a miscarriage is only punishable by a fine, while killing or even seriously injuring the woman is punishable by the death penalty.
'Human life begins in the wombThe Bible tells us God is involved in our creation from the womb:
"Did not He who made me in the womb make him, And the same one fashion us in the womb? (Job 31:15)
Yet Thou art He who didst bring me forth from the womb; Thou didst make me trust when upon my mother's breasts. Upon Thee I was cast from birth; Thou hast been my God from my mother's womb. (Psalm 22:9-10)
For Thou didst form my inward parts; Thou didst weave me in my mother's womb. I will give thanks to Thee, for I am fearfully and wonderfully made; Wonderful are Thy works, And my soul knows it very well. My frame was not hidden from Thee, When I was made in secret, And skillfully wrought in the depths of the earth. Thine eyes have seen my unformed substance; And in Thy book they were all written, The days that were ordained for me, When as yet there was not one of them. (Psalm 139:13-16)
Thus says the LORD who made you And formed you from the womb, who will help you, `Do not fear, O Jacob My servant; And you Jeshurun whom I have chosen. (Isaiah 44:2)
Thus says the LORD, your Redeemer, and the one who formed you from the womb, "I, the LORD, am the maker of all things, Stretching out the heavens by Myself, And spreading out the earth all alone, (Isaiah 44:24)'
All of these say that God created us while we were in the womb; i.e. that God was responsible for our fetal development. They do not seem to me to say that we were already persons from the moment of conception. So even if you accept the teachings of the Bible, I simply don't see how you reach this conclusion.