Let me begin this thread by explaining what I mean by agnostic. It may or may not have anything to do with religion, but has something to do with the supernatural in some way. For purposes of this thread, an agnostic film is one in which the religious, supernatural, or fantastical is a major part of the plot, but by the end of the film we are left undecided as to whether a more mundane explanation would do.
Harry Potter is not agnostic. Clearly magic works in those movies.
The Fisher King is not agnostic. All of the fantastic elements are clearly delusions.
Big Fish is a good example. While fantastic stories are told, we can never be sure if they actually happened, or ars simply tall tales. Another good example might be The Third Miracle. We never truly know if the Hand of the Almighty was at work, or if there is a stream of mere coincidences enhanced by wishful thinking. And The Messenger – who knows if Joan of Arc got her sword via divine intervention, or if, as the Dustin Hoffman character suggests, it came to her via one of many possible mundane ways?
Contact, in which the main character is agnostic, contains a lengthy scene at the end for which there is no proof it happened (any more would be a spoiler, though by now I’m guessing most have seen it).
Not a movie yet, but the entire novel Life of Pi would seem perfectly made for your description (did it happen or didn’t it).
Jimmy Stewart’s classic Harvey: does he really see a 7 foot tall rabbit or not?
The movie is about ancient Scandinavian tribesmen. Their shaman makes predictions that come true. Maybe he has magical foresight, or maybe he is just old and wise. He casts spells to make things happen, and they happen. Maybe it’s magic, or maybe he set in motion mundane processess.
At one point, he orders the tribe to behave in a certain way, lest magic spirits destroy them. They do what he says, and no harm comes. You spend the rest of the movie wondering what would have happened if one of them had broken the taboo.
Jimmy Stewart’s classic Harvey: does he really see a 7 foot tall rabbit or not?
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“Six foot, three and a half; let’s stick to the facts here.”
I figure Harvey is real enough – there’s too much that goes on outside Elwood’s frame of reference. F’rinstance, when Wilson (Jesse White) looks up ‘pooka’ in the dictionary and reads a definition that ends “. . . and how are you, Mr. Wilson.”
Below. A WWII submarine picks up three survivors from a torpedoed ship, after which the sub becomes haunted by a malevolent force… or the crew is simply going crazy as the air they breath is becoming more and more polluted as a German destroyer prevents them from surfacing. It’s a pretty effective psychological thriller.
I’m afraid that doesn’t meet the conditions of the OP; whether or not the murders occurred, there was nothing supernatural involved.
Well, everybody who watched the movie. What difference does it make whether characters in the movie witnessed it?
My own contribution is Leap of Faith, a good but little-seen Steve Martin movie, in which he plays a phony evangelical “faith healer” (who uses the same sorts of tricks as Peter Popoff, “faith healer” and genuine douchebag). There’s no way to know if what happens toward the end of the movie is really an act of God or not.