Oz and Atheism

Many of us grew up watching the classic 1939 "The Wizard of Oz." For many of us it's just a sweet children's movie but I believe it may have a deeper meaning. I believe "The Wizard of Oz" could be a tale about religion and atheism. Let me explain.You see many clues in the film and the book. One comes in the beginning of the book when Glinda says that the one person who might know how Dorothy can get home is the Wizard of Oz. She says this even though it's made evident later in the film that nobody has ever seen the wizard. This could be a metaphor for blind faith and religion.
Also, take the fact that Scarecrow, Lion, Tinman and Dorothy are all missing vital parts of themselves that only the wizard can give them, and going along the Yellow Brick Road, or a narrow set of rules, to get what they want out of life. Finally, three scenes towards the end of the film, the wizard is revealed to be a fraud and a con artist. And, Glinda reveals to Dorothy that she always had the power to go back to Kansas on her own. This could symbolize the theatrics of certain religions and how they make people dependent on them for their salvation. One more thing to think about: Oz compared to Kansas seems like a dream. It's colorful and magical, but it's ultimately shown that Oz is not all that it's cracked up to be. So, can Oz represent heaven and the Wizard, God? Don't get me wrong it could be a harmless children's story but that's just my theory.