Many Christians believe that we humans consist of body, soul and spirit. I am one of those who do, but no one can be dogmatic except to say we have a body and a spirit, certainly. God made us in His image.
If one agrees that we consist of body and spirit, at minimum, then explain where and how that soul and/or spirit resides. We can't.
If I myself exist in at least two parts, then why would I have such a struggle to believe in God in three persons, blessed trinity? And if I can't scientifically prove that I myself have a spirit soul, then how could I expect to explain the Father, Son and Holy Spirit?
Faith is the substance of things hoped for and the evidence of things not seen. Blessed are those who believe without seeing.