Credulity

defining credulity: tendency to believe readily

I'm reading an article from Salon called "Manufacturing Belief." It opens this way:

In Lewis Carroll's "Through the Looking Glass," Alice tells the White Queen that she cannot believe in impossible things. But the Queen says Alice simply hasn't had enough practice. "When I was your age, I always did it for half-an-hour a day. Why, sometimes I've believed as many as six impossible things before breakfast." That human penchant for belief -- or perhaps gullibility -- is what inspired biologist Lewis Wolpert to write a book about the evolutionary origins of belief called "Six Impossible Things Before Breakfast."

As a spiritual person, is credulity an advantage .... or a disadvantage?