In the Bible it says that one must understand there is ONE God. The thing I don't understand is that Jesus and God are the same people. If so, why do people refer to Jesus as the Son of God?
This has been argued for centuries, and I have no easy answer, because the Bible is vague on the matter. The common answer is that the Father, the Son, and the Holy Spirit are three distinct personalities of the one God. Saint Patrick was supposed to have used the shamrock to describe the unity of the trinity; it has three leaves but is one plant. Others have used the example that I am a father of my children, a child of my parents, a husband to my wife, and several other aspects without being several different people. I'm not sure either example is totally accurate or totally helpful. All I can say for sure is what the Bible says. "I [Jesus] and the Father are one." (John 10:30) "That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us." (John 17:21) "In the beginning was the Word, and the Word was with God, and the Word was God. And the Word became flesh and dwelt among us." (John 1:1, 14) Exactly how Jesus and God are one and yet separate I don't know. In some ways it is easier to understand that the Holy Spirit is one with God, because he is the living word of God (Ephesians 6:17). We can understand God's word being part of him easier than that God became flesh and dwelt among us.