The Problem with Christians

[pocaracas]

The claim that something doesn't exist is almost impossible to maintain, in the absolute sense.

That would appear to make the whole atheist belief system somewhat tenuous. It would also mean that the declaration,  "God doesn't exist" cannot be made with any certainty.

Bingo!
That's why you'll find it difficult to find an atheist here that claims that.
I go as far as I don't believe your claim that God exists.
I don't accept it as valid, as there is nothing trustworthy to back it up.

You seem to want to posit scientific ignorance - the ignorance of some mechanism by scientists - as a form of supernatural event. That is incorrect.

It's more technical than that. It is one thing to observe something in nature and say that we don't understand how that works, but it is a different situation when something goes completely against the observable laws of nature. 

Observable means that it can be observed, but need not be, or have been, observed yet.
You should not confuse the unexplained with the unexplainable.
Unexplained is that which hasn't been explained yet.
Unexplainable is that which cannot be explained, no matter how we try. You seem to think that abiogenesis falls in this category when it doesn't seem to, at all!

Supernatural events have never been observed.... Why posit them as possible? (tales of old mean little, remember)

Thats a big call. History is full of reports of supernatural activity. Are all these people liars or deluded? I've seen more than one person tell the future and nail it. What happened there?

yes... history is full of stories.
And sometimes people guess correctly at what will happen. Sometimes, the guesses are vague enough to fit many things in there. Most times, however, the guesses are wrong and, as such, are cast away into oblivion. The good guesses, however, get recorded. Can you spot the problem with this mechanism?

I don't call that supernatural... I call that luck or well honed observational skills. If you know a person, or a group of persons, well enough, you can predict, with a considerable amount of certainty, how they will behave in a particular situation.
Mobs are even easier to predict.
Thus far, not many have had the fortitude to see next week's lottery numbers. (that's not how it works!!... right, right...)