"The rational man knows that anything ascribed as "invisible, weightless, odorless, incorporeal" is much more likely to simply NOT EXIST"
or it hasn't been found yet by science. Moreover if something is not "real" or is "undetectable" it doesn't mean that it does not exist.
You said it yourself: "is much more likely" not "definitively".
That still leaves a small chance for anything "invisible, weightless, odorless, incorporeal" to exist.
Actually there are many new physics theories about objects with more than three or four dimensions (superstrings), so many scientists are trying to found proof of "invisible, weightless, odorless, incorporeal" or almost non-existant-in-our-world matter.
But until the very same moment that we achieve "total knowledge" we could not say what is real and what is not.
"My statement stands as self-evident from anyone who has received a sufficiency of primary and secondary education. If you doubt it, you only reveal your insanity, obstinance, or dishonesty. Hence, you're dismissed under one or more of those cases."
A statement can be self-evident but... it does not mean it's correct to everyone.
That's the same as saying: "If you do not agree with me you're either insane, idiot, or dishonest."
If that's it, I'm happy to be and insane and dishonest idiot.
About the main topic.
To begin with, most of you will hardly believe to a post in a board, but you asked for a proof of God's existence. Sadly I can't find anything to make you believe that God does exists, like I could do with Bush, just by writing about his appearance on your tv or monitor (or in your city if you're that unlucky). Ironically you may believe me if I say that Bush is a trained monkey, but you will not if I say that God does exist.
Of course I could chit-chat for hours about the nature of the soul, the inner spark of existance that's within' everyone.
Or about the "free will" which distinguishes humans from animals, making humans able to choose their own path (when used) without being lead by emotions or instict.
We could also talk about the bible, religions and tons of other things but there's no evidence that it's 100% reliable. That's why faith comes in.
But I'm sure that a small portion of people have heard of demonic possessions.
While the 95% of them are mental illnesses there's a small percentage of them that could not be cured without exorcism. If we do not consider exorcism a "Placebo", which would be crazy since we're talking about patients who aren't aware of their condition.
Moreover some cases are totally crazy, like you see in the movies: patients who vomits iron ( yes, iron with a % of stomach acid...), or are capable of speaking ancient languages unknown to them (impossible, unless our test case is graduated in Ancient Languages, which is difficult to obtain while being in an hospital), and they change their voice to a total different one.
So these kind of patient got cured and healed by exorcists. The "cure" would have been prayers and rituals...and it takes from a mounth to a year.
You can find such medical reports in the Gemini Hospital in Rome. That would make you think: "it's all fake", since Rome is the pope's city, but that's another story, since other european hospitals have the same kind of cases examined, let's assume that they're genuine.
But anyway that leaves a few options left.
If the patients are not ancient language graduated, with the amazing skill of changing his voice (ventriloquist?!), and a stomach who can hold solid iron for days, who set the whole thing up with a guy who calls himself an exorcists, there's a good chance that they may be honest...
You can spend a lifetime looking for a reliable biblic source but you may not find a real proof. Instead you may find a medical report of someone who suffered from a demonic possession, you can find people that will testify that it happend.
So, if it is proved that someone can be healed with these religious rituals, there must be something real in what they say
Well that does not prove that God exist, it just means that demons or whatever causes that disease do exist and exorcists have the "power" to heal it. And they say it comes from God.
Moreover, exorcists and demons are present in almost all religions, in different forms and names. ( You can search for it as a proof).
Isn't it ironic that the proof of demon's existence is among the few "100% proved things" closer to prove that God does exists?