Worldview of 'The Wizard of Oz'

I believe 'The Wizard of Oz' contains a Postmodernist worldview.
Postmodernism is the belief that no one religion is true, and that all religions should be accepted. Additionally, the Postmodernist believes all religions contain truth; just in different ways. It is also important to know that the Postmodernist thinks what is good for himself may not be good for the next person. In other words, ‘truth’ is a matter of personal opinion...there is no absolute truth.

Although its been years since I have seen the movie, one concept stood out to me. It was the theory that things are not always what they appear to be. This is portrayed in the scene where the wizard is revealed as an ordinary man; not the great, supernatural being he was thought to be.