The son, and God, are supposedly one in the same being. He is an extension of God's being, not a separate God or entity in itself.
Different but the same. What that means entirely, I'm unsure, but the Trinity doctrine teaches that there are three persons of the same being; distinct from each other and yet one in unity.
Each person is considered wholly God, not just a fragment of God, and each has their own role: the Father is appointed the head, the Son the mediator between God and man (his actions on the cross creating a way for salvation), and the Holy Spirit the convictor of sins who leads people to the knowledge that they must be saved. They work together, forever in love and unity, and are each fully God with distinctive functions and yet of the same essence.
So, it's easy to understand why people see that as being three Gods, but Christian doctrine teaches that there is only one God and that the Trinity does not conflict with monotheism.
And according to Scripture, Jesus himself claimed to be God: "before Abraham was [born; came into being], I am" (John 8:58, alluding to God's statement "I AM THAT I AM" in Exodus 3:14, a statement proclaiming his timelessness; when "LORD" is in English Bibles in all capital letters, it's a translation of a Hebrew word meaning "to be" or "He is," which comes from the same root as "I am"); and "I and the Father are one" (John 10:30). In both instances, Jews picked up stones to kill him, because they understood the theistic implications of these statements.
John of course was a disciple of Christ, one of the twelve and an apostle, and he makes the case for Jesus' deity more than the other gospel writers, although in the epistles, Peter, Paul, and unknown authors of other letters make the case for him being God as well. Considering Peter was also one of the twelve and was with Christ all his earthly ministry, that's two such people who explicitly claim in their writings that Jesus is God. (II Peter 1:1–3, "Simon Peter, a bond-servant and apostle of Jesus Christ, To those who have received a faith of the same kind as ours, by the righteousness of our God and Savior, Jesus Christ: Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord; seeing that His divine power has granted to us everything pertaining to life and godliness, through the true knowledge of Him who called us by His own glory and excellence.")
As for racism, can't say I've ever experienced it in my family, not even from my extended family. For the most part we're all conservative Christians, and even those who aren't are good people (...for the most part). It's sad to me to hear about others' supposed Christian families who are intolerant and bigoted and unloving and so forth. That's not what Christianity teaches. At all.