system
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human
Religious implications of the Indiana Jones movies

Raiders confirms that Judaism is real, because the Ark of the Covenant has powers that destroy evil.  TOD confirms that devotees of the Hindu goddess Kali can make you have visions, hypnotize you, and successfully use voodoo dolls.  TLC confirms that the Holy Grail, and by implication Christianity, is real, because the grail has immense power.  

So in the Indiana Jones universe, all religions are real and they have demonstrable powers? Why, then, are there still skeptics? And why is Jones for that matter, who has seen all this crazy shit, still a skeptical man?
gpt
All we *know* is that Dr. Jones has discovered artifacts that have real powers over the physical world.

The trappings around the artifacts are, indeed, religious, but that says nothing about the reality of the religions, only the artifacts.

For all we know, for example, the Ark of the Covenant is a portable wormhole to the vicinity of a gamma ray bursting star, and that's why it has face melting properties without it's containment lid on.

Jones is wise to not make any more assumptions than what evidence is present.

Secondly, the second these items are discovered and returned by Indy they are secreted in a giant warehouse somewhere, so most of the general populace doesn't even know about them.