Most Jews and some Christians have a problem with the "Trinity."
If there's only "one God," how can Jesus be God and God be God and the Holy Spirit be God? I will try to help you understand this as best I can in this limited space.
Single cell organisms reproduce through a process called asexual binary fission; they simply split into pieces with identical DNA. Now, consider the miracle of birth...a sperm enters the egg and voila, we have a new creature (after the required gestation period)
God created both the single cell and the miracle of birth; he can easily divide himself (like a single cell organism) and send a piece (the Holy Spirit) into an individual (like sperm entering an egg); and voila, a new creation...human, with God's DNA. To wit, a "child of God" with a heavenly "Father." Thus, Jesus, the "first born" of many brethren (Romans 8:29), is not "God" per se; he was a human who was reborn Spiritually...a living example of how God identifies and separates his children from everyone else.
When Jesus said, "I and my Father are one," (John 10:30) he was referring to the indwelling of the Holy Spirit that connects God to all of his children...as in a "marriage;" indicative of the relationship God has with all his children...two become one.
Now do you understand the importance of being "born again?" Unless or until you are reborn Spiritually, you are not a child of God...you cannot see or enter the kingdom of God; and have no part in the inheritance God has for his children.
Until you are reborn Spiritually...nothing else matters.
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