First of all, if I went to have my fortune told and saw and woman writhing around uttering nonsense, I would certainly think there had to be something a little strange going on. Granted, the reality of the situation was that the Oracle was high on ethylene, but if you didn't know that, you could reason that her altered mental state was due to a higher power. Those who went to visit Delphi were also unaware of the "spies" that listened in on their conversations while they were waiting for their prophecies. If I didn't know the Oracle had already been advised about my question, I would have a hard time explaining her ability to foresee the future.
Although we now know the Oracle's power was a hoax, it would not be fair to view the Greeks as naive for believing in it. There are plenty of people in modern society who hold similar beliefs regarding psychics or religious prophets. Although the majority of us don't believe they are credible sources, there are those who are convinced they can predict the future. Similar to the citizens of ancient Greece, these people look at all the occasions in which the supposed prophets are right, and simply explain away the instances in which they are wrong.
Although our visit to Delphi did not change my beliefs regarding prophets and psychics, it did open my eyes and help me see how some people could believe in their power. Obviously something had to influence the thousands of Greeks who believed in the Oracle's ability to foresee the future.
