God Is Love

Christianity may be summarized [with the understanding that all summarizations reduce broad reality into a small space at the cost of some broader understanding] as follows:
God, the great "I Am", is.
The "I Am" intervened in humanity through a small culture of relatively insignificant, from the worldly power standpoint, humans.
"I Am" started a process of delivering them from the darkness of tribalistic violence by empowering them to overcome other tribalistic peoples and giving them a set of commandments that constituted a moral/ethical code for prospering them, and eventually all nations.
In the course of their slow awakening, "I Am" began insinuating into their consciousness the concept of a coming Messiah who would deliver them and eventually all the nations of the earth from the darkness of spiritual blindness that resulted in immense self-inflicted suffering.
That Messiah has come with the supreme teaching that "I Am" loves all of us with the love of a maximally evolved parent for his/her child--the greatest imaginable human love; and He taught us [and continues to teach through His Holy Spirit within us] to love each other with the Love that He demonstrated in human history: sacrifice of Self and only Son for the maximal common good.
This Love is the only doctrine. It fulfills all the commands and prophetic revelations. It is the only way of being that delivers us from the unnecessary suffering that we inflict upon ourselves.
So the apostle John, who was spared martyrdom and lived to an old age as an exile on a small island, having much time to contemplate what he had experienced with the Messiah, Jesus, writes:
"Beloved, let us love each other, for love is of God, and everyone who loves is born of God, and knows God. He who does not love does not know God, for God is Love." 1 John 4:7-8.