The problem in a “reason vs. faith” topic is we sometimes face with semantic difficulties. It is really more of a “what is the definition of faith you are using” kind of a problem.
What do you do when you see the train coming? Common sense tells you to stay away from the tracks.
What happens when you are short of cash? Do not spend.
It's just common sense.
It is interesting how education and science allow one to look at the world and honestly admit that it is far more complex than one can ever hope to comprehend. Still, even with the discipline of empiricism, human nature, fear and impatience cause us to simplify things to a point of useless opinions instead of something constructive and usable.
In law, a crime can be categorized as either malum prohibitum (“wrong because prohibited”) or malum in se (“wrong or evil in itself”). In a civilized community, murder, rape, theft, robbery, and kidnapping are generally perceived as mala in se regardless of where they were committed or even if there were no written laws punishing them. On the other hand, illegal possession of drugs or firearms and traffic and tax violations are mala prohibita – crimes in certain societies because their statutes made them crimes.