The soul/spirit dichotomy is a discussion ripe for disagreement. I think discussion, however, can prove fruitful for growth and maturity in Christ.
Ephesians 4:11-13 instructs us on the purpose of the gifts of apostles, prophets, evangelists, pastors and teachers to the Body of Christ are for the equipping of the saints "until we all attain to the unity of the faith, and of the knowledge of the Son of God, to a mature man, to the measure of the stature which belongs to the fullness of Christ."
Here in the Bible-belt, one might infer from attendance at many, if not most Sunday morning services that this scripture is expanded to say, "and of the knowledge of salvation through the Son of God." Certainly, I agree that salvation of the souls of humans is a main thrust of the NT writings. Further it is clear, such is a commonly held belief among Christians and as such is a part of the "unity of the faith." I wholeheartedly agree it is an important component of the message of reconciliation we bring to those who perish spiritually. Yet, in and of itself, salvation of souls as the core meaning of the work of the Anointed One on the cross and the supernatural consequences of the resurrection is at best limited in its articulation of the supernatural intent for humans in the Father's heart; and at worst, it is incorrect and artificially binds those so taught in less than the full power of the knowledge of the Son of God.
The focus of teaching on the salvation of souls is, in my estimation, a product of the focus of humans on their soul existence. I observe we are largely concerned with our "body" experience throughout our lives, and thus, we focus our contextual understandings and development of our mind and hearts around the natural reality of our physical existence. Our intellectual constructs are highly developed but limited to knowledge of life as the soul within the body. Without the illumination of the Spirit of God, humans are trapped in the soul, build all understandings from that limited vantage point, and cannot see Jesus as the Christ.
There are differing semantics for the soul. Some are concerned with psyche, and an entire branch of knowledge called psychology has become a science (science as a term rooted in a word meaning "to know") in which one may be credentialed. This knowledge seeks to understand and provide therapy for the mind/body connection which is estimated to be at the root of human behavior.
My concern for searching out the topic in discussion is intended to push the envelope a bit. Is there a lack of unity in our traditions of faith? Is this lack a function of soulish constructs which result in disagreement and division? Is it possible that a supernatural experience of spirit, in and through the living Christ, is the unifying feature of Christian perspective?