Question: "Do we have two or three parts? Body, soul, and spirit?"
Answer: Genesis 1:26-27 indicates that there is something that makes humanity distinct from all the other creations. Human beings were intended to have a relationship with God, and as such, God created us with both material and immaterial parts. The material is obviously that which is tangible: the physical body, bones, organs, etc., and exists as long as the person is alive. The immaterial aspects are those which are intangible: soul, spirit, intellect, will, conscience, etc. These exist beyond the physical lifespan of the individual.
All human beings possess both material and immaterial characteristics. It is clear that all mankind has a body containing flesh, blood, bones, organs, and cells. However, it is the intangible qualities of mankind that are often debated. What does Scripture say about these? Genesis 2:7 states that man was created as a living soul. Numbers 16:22 names God as the “God of the spirits” that are possessed by all mankind. Proverbs 4:23 tells us, “Above all else, guard your heart, for it is the wellspring of life,” indicating that the heart is central to man’s will and emotions. Acts 23:1 says, “Paul looked straight at the Sanhedrin and said, ‘My brothers, I have fulfilled my duty to God in all good conscience to this day.’” Here Paul refers to the conscience, that part of the mind that convicts us of right and wrong. Romans 12:2 states, “Do not conform any longer to the pattern of this world, but be transformed by the renewing of your mind.” These verses, and numerous others, refer to the various aspects of the immaterial part of humanity. We all share both material and immaterial qualities.
So, Scripture outlines far more than just soul and spirit. Somehow, the soul, spirit, heart, conscience, and mind are connected and interrelated. The soul and spirit, though, definitely are the primary immaterial aspects of humanity. They likely comprise the other aspects. With this in mind, is humanity dichotomous (cut in two, body/soul-spirit), or trichotomous (cut in three, body/soul/spirit). It is impossible to be dogmatic. There are good arguments for both views. A key verse is Hebrews 4:12: “For the word of God is living and active. Sharper than any double-edged sword, it penetrates even to dividing soul and spirit, joints and marrow; it judges the thoughts and attitudes of the heart.” This verse tells us at least two things about this debate. The soul and spirit can be divided, and the division of soul and spirit is something that only God can discern. Rather than focusing on something we cannot know for sure, it is better to focus on the Creator, who has made us “fearfully and wonderfully” (Psalm 139:14).