"You need to strip the God from Jesus the man, and the stage magic that was his stock in trade, then put the rest of what he said in the context of his time. A good place to start would be the Jefferson Bible in which Jefferson, an atheist, well, Deist politically, literally cut up the Synoptics to find out what Jesus was all about.
While you are at it forget about prooftexing it is no more becoming for an atheist than for a fundie.
As a starter take Matthew 22: 37 ff.
...Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. 38 This is the first and great commandment. 39 And the second is like unto it, Thou shalt love thy neighbor as thyself. On these two commandments hang all the law and the prophets.
There is a good reason that much of modern Christianity, the 'Progressive Christians' have for the most part reduced the entire law and the prophets, that is the whole Bible, to this teaching of Jesus. An atheist can learn simply by studying this and its context.
True it refers to God but look at the God it refers to: Thy God. Not the God of Moses or Abraham, or the prophets, or the priests. Thy God, God which speaks directly to the individual. With this three letter word 'Thy' he is basically telling the whole religious establishment to go to Hell in their own way.
'Love thy neighbor.' He goes on to identify the neighbor as a Samaritan, in our terms a Muslim terrorist. He had recently left a Samaritan village where he was refused hospitality, one of the most grievous affronts in that desert society. And now a Samaritan is his neighbor?
'As thyself.' In those days as now religion made a good living selling self-hate. Jesus is clearly stating that all humans are worthy of self-respect. You can't get much more humanist than that. Theistic humanist? Of course theism was the language of the time."