The statement made and presented as a fact is not factual.
Tell it to the Founders. "We hold these truths to be self-evident..."
What historical record are we reading wherein the Founding Fathers define a human person's anthropology?
I can understand how somebody who has never had saving faith (I'm not referring to yourself) might be blinded to only think in soulish terms, thinking even more blindly that nothing exists in human perception other than the bodily senses and rationalism, but then again such was myself prior to having a regenerated human spirit, able to perceive thinks of the spirit and beyond that of only the body and soul.
The definition of a human person in Divine terms includes the body, soul, and spirit. The bodily portion of a person might come into physical form and begin some functioning at the point of conception, but that insufficiently defines human life. The human body by itself is not identical with human life. Human life by divine standards as originally made and created includes body, soul, and spirit. More accurately from Hebrew language, it is more than plant life, it includes a breath.
Indeed it is factual. No matter how many times you deny it. Every single person you've ever seen or known started in this world in exactly that way.