When matters get so complicated and intertwined it sometimes helps to examine the basics. The relation between words and their corresponding meanings is completely arbitrary, for example the letters and sound of “cat” bear no resemblance whatsoever to the dexterous quadrupedal carnivore.
Fictional creatures are made up either through:-
A) Modifying an existing creature; dragons:- a big flying fire breathing variation on the dinosaur, unicorns:- horses with horns and capacity for flight, goblins; small humanoids, zombies:- humans reduced to hungry beasts with no higher brain functions.
B) Creating a completely fantastical entity that deviates from all models of living creatures, usually this type is nonphysical; ghosts:- a manifestation of a dead human being, angels:- good servants of god, the devil:- god’s arch enemy.
The primal characteristic of all these entities is that they are works of our imagination, there is no record of any of them ever walking this earth. The holy books of various religions are based, mostly, on the interactions of some form or another of fictional creatures. The god of the Abrahamic religions is described only as the creator, but since the holy books offer no account of the creation process this description is of no value. It takes faith to buy into the existence of this characters. But faith – be it fear of hell (stick), love of heaven (carrot), or excessive brainwashing of children- can not back arguments presented to the critical mind. Stories and characters of holy books are above-average tales of fantasy, however, when they are regarded as absolutely true and lead to bloodshed, fascism, and fanaticism I think it is time to rethink the authenticity of these tales and consider the fact that the characters in these holy books, let alone their actions, are purely mythical representations of the whims, dreams, and fears of man when he was just beginning to think of what to make of this gigantic universe.