The soul is created at the moment of birth, as distinct from the body which is formed and passed genetically and grows within the womb.
There is association with perceptions between body and soul, but too many phenomenon of perceptions in the soul, which are not associated with the body, to identify the body as the soul.
The issue is a classic Creation vs Seminal interpretation of the origin of human life.
You are welcome to your opinion. I disagree.
I see very little difference between a child partway down the birth canal and the same child after takings its first breath. If the second one has a soul, then so does the first.
The very idea of a soul is religious, BTW. From a scientific standpoint the development of the new life is continuous from conception to birth and adulthood. Deciding that any point on that continuum constitutes "personhood" is inherently arbitrary.
How do you know?
Do you think you're God?
FACT: The human PERSON comes into physical existence at the moment of biological inception, when a human egg is fertilized and the first division of cells occurs. A unique individual with unique DNA.
The United States Constitution
"No PERSON shall be...deprived of life...without due process of law."