What Is the Heart of Christianity?
To me, the absolute center of Christianity is embodied love. In my reading of the Bible and in my experience, that's it...hook, line, and sinker. In Genesis it is God's love embodied in Creation, with every part dependent on every other part for perfect function. When human beings couldn't seem to keep their part of the harmony going, God embodied love more specifically in human form, in the person of Jesus. Jesus thus becomes both the embodiment and the revelation of God's love. Christians consider themselves to be the Body of Christ...those who try to continue to embody God's love in and for the world. If it is not done in love, it is a noisy gong or a clanging cymbal. It matters even more than faith, Paul says. When Jesus is asked in Luke 10 what must be done to inherit eternal life, the answer is to love. Love is at the center of Creation, because God is love. Embodied love is at the heart of Christianity because that's who Jesus is.

--Anne Robertson
From the question “What Is the Heart of Christianity?”