Even the Bible is up for debate as to when life begins.

According to Genesis 2 - The beginning of Adam's life in verse 7:

Then the Lord God formed man from the dust of the ground and breathed into his nostrils the breath of life, and the man became a living being.
Clearly, life begins when you draw your first breath. That is when God places your soul in your body. Your soul enters your body with your first breath and it leaves with your last

I personally am very pro-choice and I wish the government would stay out of women's bodies.