If everything has a purpose then evil doesn't exist

[Anomalocaris]

So can any fictional creation be seemingly known as real if you approach it on the terms outlined in the fiction.  But doing so should be the preserve of children playing make belief during games, not adults.

Yes indeedie..

But this works both ways.. From where I stand the fiction is God does not exist. So then that begs the question who is the one who determines what is and is not fiction?

It is not the one, but the weight of evidence and the rule of not hiding implied complexity of a proposition that require explanation behind idiotic assertions.  So no, it does not cut both ways.   The cutting and bleeding out is all on your side.