Does the invisibility of the soul and spirit mean they are not real?
No. The soul and spirit are invisible, but that does not mean they are unreal. They are real; the body is only an outer tabernacle. God works in the invisible realm of the soul and spirit, which human hands and baptism cannot touch or change.
Les teaches that invisibility does not equal unreality. He illustrates this by asking whether an autopsy would ever reveal a person's soul or spirit; the answer is no, because they are invisible. Yet he insists they are real—"you better believe it's for real, or you wouldn't be here." The soul and spirit belong to the realm where only God works, and human hands cannot touch that. Baptizing the body a hundred times cannot change the soul or spirit, since the body is only an outer tabernacle. Les then connects this to Romans 6: being baptized into Christ means being identified with His death, buried with Him, and raised in resurrection power as a new person placed into Christ. He points to I Corinthians 12 as foundational and simple enough that no seminary degree is needed.