I wrote "basic tenets of Jesus's teachings" for a reason - precisely because to write, "basic tenets of Christianity" would be to open up a whole can of worms re. Scriptural interpretation. For example, the Pauline epistles - brilliant as they are - are interpretations, interventions into specific situations. So, following Paul, I will disregard both Deuteronomy and Leviticus, since they belong to the OT or the old law, that which was abrogated by Christ's coming: "But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God." (Romans 2:29). 

And I will draw your attention to these: " ... if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself. Love worketh no ill to his neighbour: therefore love is the fulfilling of the law" (Romans 13:9-10).