Just a simple question for you. Do you believe that a person is born of God when he believes that Jesus is the Christ, the Son of God?:
"Whosoever believeth that Jesus is the Christ is born of God...For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith. Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?" (1 Jn.1:1-5).
You say that you cannot understand a half of what I say but now we will see if you believe what is so plainly stated in the Scriptures.
Yes or no?
Do you believe that a person is born of God when he believes that Jesus is the Christ, the Son of God?
All truth is not in one verse. John also assumes other truths in this proof text. I once had mental assent to the truth of Christ/Christianity, but was not born again (head vs heart). There are people that could agree intellectually with that statement, but not truly trust the person and work of Christ alone for salvation (involves knowledge, assent, trust, notitia, assensus, fiducia according to the Reformers).
You could find a verse where Paul talks about the Son of God, but that does not mean I Cor. 15 about the resurrection as gospel truth was not necessary.
The person and work of Christ cannot be arbitrarily divorced like you do to retain a wrong preconceived idea.
If a person recognizes the Deity, death, resurrection of Christ (unlike Muslims) and has more than mental assent like Satan does, then they will be born again (Rom. 10:9-10; Jn. 1:12; Jn. 3:16; I Jn. 5:11-13).
The gospel includes truths about God, man, Christ, repentant faith/continuance in the faith. Not all legs of the stool are always in one verse.
If one does not believe that God exists, they will not be saved. If one believes Jesus is Son of God (Mormons claim to with semantical issues), they may or may not be saved. The true person and work of Christ is necessary (a dead Messiah who did not rise does not save).
Paul was not the first or only one to understand these things (read John, Peter, etc. closely...you are not as bad as Nick for rejecting John).