Your question goes to the basic belief of the Southern Baptist belief in that we believe that Jesus was wholly man and wholly God.
When Jesus was referred to as the son of man (usually by himself) he was making reference to his human which he inherited through Mary his human mother.
Luke 1:35 KJV And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
When he was referred to as the son of God it is in reference to his Deity which He inherited through the Holy Spirit.
In Luke 1:35 we are informed that the Birth of Jesus was a result of Mary being pregnant through the Holy Ghost, by the Power of the highest.
With this we are informed that Mary became pregnant by what can be referred to as artificial insemination for lack of a better term.
This was in keeping with Isaiah's prophesy in:
Isaiah 7:14 KJV Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
This concept has met with much controversy, even in view of the fact that it is possible through a medical procedure today.