And anyway, everyone knows who the characters are speaking to when they look unapprovingly towards the heavens and plead with “the Creator.” That said, the word is spoken often and at times it does seem forced. Surely some other name—like Lord?—could have also been used.
(Similarly, some have criticized the movie for stating that human industry is inherently evil. But any film about a family that denudes a forest to build an ark isn’t saying that man’s use of creation is always bad.)
This doesn't mean that other sins aren't present. The films depicts all manner of vice and evil at odds with human dignity. Seeing this, Noah recognizes that he too is infected with the sin of his ancestors.