God knows everyone before he creates them, their soul is the person themself. The soul is real before it begins to live in a body. At Conception the soul is alive, and can die.
Jer 1:5 Before I formed thee in the belly I knew thee; and before thou camest forth out of the womb I sanctified thee, [and] I ordained thee a prophet unto the nations.
Exd 32:33 And the LORD said unto Moses, Whosoever hath sinned against me, him will I blot out of my book.
Rev 21:27 And there shall in no wise enter into it any thing that defileth, neither [whatsoever] worketh abomination, or [maketh] a lie: but they which are written in the Lamb's book of life.