Ah, but we would be remiss to note that both Judaism and Christianity (and even Islam...) start with this telling of succession of the bloodlines through family.
Jesus Himself points out that “loving thy neighbor” is the most important of the Commandments. Which also gives a nod to your assertion.
But: Without Jesus having been Jesus (and fulfilling His roll as the Christ) these words would have been of secondary importance. His Teachings are worthy of meditation and living- but only because of the source of the wisdom, Christ Everlasting.
The Message of the Bible is of Love. The bringer of that Message is Christ. The imporatance of Christ’s roll in this is why we are “Christians”. This explains my assertion that “Christians need to know this basic truth (John 3:16) and the rest is details.”
Without Christ’s Sacrifice, the message would just be coming from another in a line of prophets.
You cling to John 3:16. It's a wonderful passage but it is not more wonderful than John 1:1 In the beginning was the Word: and the Word was with God: and the Word was God. 2 The same was in the beginning with God. 3 All things were made by him: and without him was made nothing that was made. 4 In him was life: and the life was the light of men.
Here we discover Christ's identity as God Himself, the second person of the Holy Trinity.
What your theology lacks is the why and how. Jesus brought a Gospel of love but without His sacrifice, there was no redemption... no covenant. As John says, he who believes in Him shall not perish but have everlasting life. What does it mean to "believe" and why will we have everlasting life? "Belief" means more than willingness to listen, it means following faithfully. We do, as Catholics, what Christ told us to do... not always understanding. It is because Jesus is the High Priest offering the sacrifice of Himself for His Bride, The Church, to be joined to Himself, the Bridegroom, as one flesh. You can not fully understand John 3:16 without understanding who Jesus is, what is the New Covenant and why the need for sacrifice. What I gave you above does all of those things. The everlasting life we are promised is the inheritance of sons as we are rejoined to God's Holy Family through Christ's covenantal offering.