Stuff
More stuff
Your logic is faulty, regardless of what you argue about. It is not about Nessy vs gods, or even evolution vs gods. It is about you attempting to apply different kinds of logic to different situations, when in fact, they are the same. You can replace Nessy with anything you like, gods, the Flying Spaghetti Monster, Russel's Teapot, aliens, anything similar. They all have zero proof either for or against, and it is therefore ridiculous to assume that it applies differently to each of them.
It's mostly a semantic issue here. Let me try to untangle what I'm trying to say there...
If there is no evidence for something, believing (in) it is a matter of faith, but the lack of evidence in favor of it is pretty compelling evidence against it. Therefore, believing that it doesn't exist isn't just a matter of faith, because the lack of evidence in favor of it existing forms a compelling argument against its existence. I believe the statement "In the absence of compelling evidence in its favor, atheism is a matter of faith rather than reason," is true, but also that there
is compelling evidence in its favor, in the form of complete absence of evidence of the existence of the things it purports do not exist, therefore it is a matter of reason, rather than one of faith.
And again for the third one, you just really can't see it, can you? If a deity truly was irrational, then all logical discussion about it is completely worthless, and you would be stupid for trying to argue it either way. Because if such a deity existed, no logic could be applied to it, INCLUDING whether or not it exists or not. You are assuming that a deity would be irrational, which means that you couldn't use logic with it. By assuming that a deity is irrational and illogical, then you cannot use any sort of logic at all.
If something is all powerful, it wouldn't be constrained by any set of laws, at least none you are familiar with, otherwise it is not all powerful. Therefore, it could do things which contradict the laws you are familiar with. It is indeed pointless to postulate the existence of such a being, and thus we should disregard the possibility of its existence.
I really think that all of this stems from you simply assuming that gods cannot exist. It is completely ridiculous to assume anything exists or does not exist with no evidence either way. No evidence for it does not equal evidence against it by any means, no matter what you apply it to. You have as much of a bias against gods that theists have for gods.
Atheism is the state of disbelieving outrageous and groundless claims. Further, we know that people can and do
make shit like that up, and we can observe dramatic shifts in the memetics of religions of the years. All this paints a pretty compelling picture against their claims, while they have exactly nothing except personal feelings and "but I was told this was true!" to back up their side.