If he was a logical and rational thinker, he would not believe in a supernatural dictator that watchs your every action and cares about with whom and how you have sex. A logical thinker would not believe that the laws of nature would be suspended so that miracles could occur. You can definitely say he has faith, which involves belief without evidence and is often irrational. Faith is not necessarily a good thing. Science is what enabled man to fly to the moon. Faith is what enabled men to fly into buildings.