The centrality of Jesus again distinguishes between truth and error. If He is God come in human flesh -- you are from Him. If you deny Jesus is uniquely from God, you deny it all.
God sent him as a propitiation for our sins. That is, he loved us enough to send Jesus to receive and satisfy his wrath that we should have received. This is love, not that we love God, but that He loved us.
It is this love of God that needs to be passed around to one another. The proof that you love God is that you love others.
The love of god casts out fear and if I love him I demonstrate it by keeping his commands. We do not have a lvoe of equals, but of a subject to a master.