It's essential that science says "I don't know". It's fundamental to the whole method.
You're entitled to your views. However, I'd answer your questions above differently:
Can the universe create itself? We don't know. Did it come from nothing? We don't know.
To me, the illogical aspect is jumping from "I don't know" to "Therefore: a creator".
It's at that point the infinite regression problem of an endless chain of creators kicks in, and that's a problem for theists not atheists, contrary to your statement earlier in this thread.
Note: And Dawkins is still not a polytheistic creationist as an aside. Your earlier point that he is agnostic is technically true and he very clearly discusses and concedes this point. See the Dawkins Scale, where 1 is "I am absolutely certain there is a god" to 7, where "I am absolutely certain there is not". He is, however, practically in any meaningful sense, an atheist and it is, frankly, his scientific mind set that has him a self declared 6.9 on his own scale.