There should be no confusion about when life begins. It begins with God . When He created Adam he formed, God saw each of us as we were already born. In Jeremiah I:6 (NIV) He informs the prophet:
“Before I formed you in the womb I knew[a] you,
before you were born I set you apart;
I appointed you as a prophet to the nations.”
He also carefully placed His stamp on every man in the loins of Adam – a stamp that replicates itself from generation to generation. David utters these words in Psalm 139 to remind us that God envisioned us before conception:
For you created my inmost being;
you knit me together in my mother’s womb.
I praise you because I am fearfully and wonderfully made;
your works are wonderful,
I know that full well.
My frame was not hidden from you
when I was made in the secret place,
when I was woven together in the depths of the earth.
Your eyes saw my unformed body;
all the days ordained for me were written in your book
before one of them came to be. (v. 13-16).
Therefore, activity that occurs in the womb is only the continuation of who we are.because we will be what God has fashioned us to be when we receive our glorified bodies. Though death will mar our bodies, our existence will not end. On the other hand, because a baby conceived in the womb is not non-existent because it has not been born.
If you think that a fetus has no awareness – think again! Babies are very sentient from the womb and God imparts knowledge to them even there as the psalmist David reminds us:
Surely I was sinful at birth,
sinful from the time my mother conceived me.
Yet you desired faithfulness even in the womb;
you taught me wisdom in that secret place (Psalm 51:5-6, NIV).