Of course, it’s a travesty, but a very widely held one. We all have heard how some people caricature religious believers. On weekdays, they are critical, want proofs, look for arguments, and believe something only if there is no further doubt. Then, on Sundays, they turn a switch, set their understanding to zero and their gaze on infinity. The contrast painted in this parody is clear: Religious believers live a schizophrenic life. It is the life of reason on weekdays and the life of faith on Sundays. This perceived contrast cannot be true, though. It is based on distorted and shallow concepts of faith, reason, and the differences between the two, as we will see in this book.