What then does it mean to walk by faith? It means to choose to see everything from the perspective which God has presented to us in the Bible. Even if it involves blatant rationalisation. Even if it seems self-contradictory.
Religion accepts and celebrates the fact that we blatantly rationalise all things to fit our world-view. But if scientists do that, they have no excuse.
This was presented in the context of having died to the law - being thus crucified with Christ, and therefore set free of the law. So in all things we remember, believe, and act in the knowledge that the law no longer has power over us, but love must motivate us.