When one refers to the preaching of "The Cross", he should be referring to the Gospel of the Lord Jesus Christ which includes... the Old Testament prophecies pointing to Jesus, the virgin birth, the sinless life of Jesus, substitutionary death, burial and triumphant resurrection of the Lord Jesus Christ. All these aspects must be preached for without any one of them, the Gospel is incomplete.
Without any one of these preached, the message is incomplete. How could Jesus pay the price if He was not born of a virgin, if He was not sinless, etc? Jesus and His finished work is the message of the cross. The preached message of the Cross must always point the listener to a PERSON, the Lord Jesus Christ, the Only Begotten Son of God, the Messiah and the Savior.
The Gospel must be preached to the unsaved for if one does not receive Jesus as Savior, he will spend eternity in the Lake of Fire. The Gospel is the Good News that Jesus died to save us. He shed His precious blood for our sins. Jesus rose again for our justification. We can be forgiven of our sins and we can walk in newness of life with Him while on this earth and spend eternity with Him forever when we die. Jesus came that we might have life.
Jesus said:
John 12:46 I am come a light into the world, that whosoever believeth on me should not abide in darkness.
John 10:10 The thief cometh not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly.
John 3:16-18 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that the world through him might be saved. He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God.