You wrote, "The psalmist says that God knew me before I was born"
That sounds to me that God knew your soul before your soul entered flesh, and that interpretation is compatible with your statement that God wasn't referring to knowing "a clump of cells." We're now back to asking when the soul enters flesh, before the first breath or with it.
You wrote, "Thou shall not kill."
Mistranslation from the King James. The original Hebrew is translated: "You shall not murder." Hebrew has different words for "kill" and "murder" and the word for "murder" is used here, and nowhere in the Old Testament is "murder" used to refer to causing a woman to lose an unborn child. Nor is the word "kill" for that matter.
You continued,"The fetus is a human, and it is alive. If you kill it, you have broken God's commandment."
Citation, please, where the Old Testament uses either "murder" or "kill" with respect to the unborn.
Where you really destroy your argument is citing Exodus 21:22-24, which punishes a fight causing a woman to miscarry with a fine, but applies further penalties "life for life, eye for eye, tooth for tooth" only for harm done to her.
I note that none of your further citations are from the four Gospels, so I'll leave it that Jesus didn't find abortion worth commenting on directly.