It is a metaphysical certainty that it is man-made.
No it isn't.
I do love the "ridiculous to prove a negative" part, though. So you can make all sorts of claims about other people's beliefs being false, but when they ask you for a defense you back-up and say that its "not fair" for you to take the scientific route and be forced to eliminate all other hypothesis first? Fine. But then you simply can't justify the "certain knowledge" attitude.
Once again, this is another one of your arguments that I've seen come straight from the mouth of Ayn Rand (who herself was just impolitely regurgitating her tragic mistranslations of stuff that people had already been saying for a hundred years at least) . It's time to give that psuedo-philosophical shock-artist a rest already and read some real thinking material.
You are complicating something that is very simple. Here is the procedure: You claim the existence of an entity or phenomenon, then you prove it exists. You do not imagine an alternative to that which exists, declare it to be real, then demand that others disprove its existence.
To get away with this nonsense you need to invent another concept that is anti-real and anti-scientific and anti-Man. I am speaking of course of the terrible concept known as: faith. Faith is the dubious foundation upon which the whole silly concept of God is built (and I use
that term very loosely in this context...).
Faith, of course, is the necessary pre-cursor that leads you to Sharia Law, the Crusades, or even just Eddie Long. It's a slippery slope, this "denying reality" thing...