No.
No.
Yes.
I agree.
Yes, although subject to the fall and sin entering the world.
Yes, but prior to the successful implantation there is an already existing living and growing human being.
Many fertilized eggs do not implant, but I wouldn't say that was God's design. I would say it's probably one of the results of the fall and sin entering the world.
Ok, I see the consistency in your view.
It's then to
when the God-given spirit is put in the developing human body -- since it has to be at some moment in time, as an individual's spirit seems by scripture to already exist before it is given by God into that developing human body:
Jeremiah 1:5 "Before I formed you in the womb I knew you, and before you were born I set you apart and appointed you a prophet to the nations."
and
Ecclesiastes 12:7 before the dust returns to the ground from which it came, and the spirit returns to God who gave it.
So, the individual spirit already existing, already known by God before the physical body is formed in the womb, then placed in the developing human body at some moment.
When though?
Here are 4 moments that come to mind as possibilities:
Fertilization (I think unlikely due to the reasons above previously, about the many nonviable fertilized eggs God knows will die shortly -- that it seems He would not choose to put a spirit in a nonviable (soon to die) fertilized egg)
Implantation of a viable embryo (7-14 days later)
Or, when the woman suddenly
feels in a subtle, deep way something (not the same as the testing or thinking or merely noticing the period is late) that she is pregnant
Or, finally the moment of first true
consciousness, which would require we can think both neurons and possibly spirit together (possibly as early as 11 or 12 weeks, but possibly later such as when able to respond to music).
After all, if the body hosts the spirit, and the spirit leaves as consciousness dies....then....logically, the spirit is associated to consciousness. Then it would be plausibly associated to the body through consciousness, thus through neurons, so not associated before neurons.