Scientifically disproving a creator is impossible. You're right. However, finding evidence that specific creators do not exist is possible. When the only proof of that creator is in a book, that book is open for scrutiny. When it makes certain scientific claims and those claims are easily put to shame, it's easy to figure out the book was written by people who have no divine knowledge.
Edit: And as for the cause and effect...there's this thing called the big bang...that is a cause. and an effect. A creator who has always existed has no cause. If the creator has always been, that sort of bursts your cause/effect argument.
What caused the Big Bang? Everything is stable as this infinitely sized singularity, then suddenly explodes...why? For what purpose????
Think about this...there are super massive singularities at the center of the galaxies, yet we never see them suddenly explode in a Big Bang event...shouldn't we see evidence of such explosions? Why would it only happen in the Big Bang Singularity? Add to that count the number of singularities created after large suns go super nova...yet no evidence of those smaller singularities exploding into Big Bang events either, right????
That pretty much indicates something caused the Big Bang, otherwise there woukd be evidence of these other Singularities spontaneously exploding too. At least that is my opinion.