No rational basis exists. Your claim is that we are “programmed” to be altruistic. If that were the case we would not need moral education at all or ethics classes for athiests, we just need to follow our kind and sweet natures. We are biologically programmed to do good! The Christian view is in many respects antithetical to yours. We are by nature sinful and prone to act selfishly. We struggle to meet do God’s will, to love our brothers as ourselves and we fail; we need Christ’s forgiveness for our sins because we cannot do this on our own power.