Evidence for atheism

[FatAndFaithless]

Well, be it god or the universe, you have somekind of unexplainable fundamental complexity

Unexplainable fundamental comlpexity? What does that even mean? Besides, just because something is unexplained currently doesn't mean it's unexplainable, nor does it mean you can toss on some supernatural crap which is in and of itself, unexplainable.

and is almost logical necessity that something always existed in order to generate something

No, it's really not. Again, you don't get to toss in an eternal cause or creator just because it 'makes sense to you'. That's not how science works.

so the argument for complexity of the uncreated cause is not exactly strong.

Again, lots of words with a lot of baggage, might want to clarify exactly what you're trying to say here. If by "the complexity of the uncreated cause" you just mean the current state of our reality and how we perceive 'complexity' in nature, then you're out of rope. There's nothing but evidence for natural emergence of complexity, as nature is all we have the ability to measure. Again, you don't get to stick a god on top of everything. We have evidence of nature existing, and that nature has what we call complexity. There is absolutely nothing there to suggest a god or a creator.