God took care of the 'doing' part via Jesus. We just have to recognize it.

Why did he bother sending Jesus? Unconditional love. Nobody 'deserved' it based on their own 'doing'...

Christians follow the teaching of Jesus. Some get a little side tracked and mislead in areas... But all we need to do is look to the Bible. The NT was written by the direct apostles of Jesus. Our current Bible translations are pretty darned close to the original texts\letters....