You probably know that it is not a good idea to live your life by faith. If someone just tells you a gun is not loaded, you do not point it at your face and shoot without weighing the facts. You don't put your hand on a hot stove burner just because it is still not red, because you "believe" that it is not hot. You do not cross the street on faith. You do not automatically believe all claims. That would be silly.
The question is, if you base your knowledge on reason, why do you claim to make moral decisions based on faith?