Nice artwork and literature inspired by imaginative thinking is fine, just remember to call it fictional/mythology rather than forcing little kids to believe it as truth, with threats of eternal punishment.
That's true. It's terrible to frighten kids.
Edited:
That happens everywhere already.
Look at philosophy, the arts, politics and even sports.
Each one of them already holds a myriad of 'cults' with their own unified opinion.
For example:
Pragmatists, Existensialists and Idealists in Philosophy
Surrealists, Introverts and classical artists in the arts.
Thing I love about humans is that we can take any idea in our head and twist, fold and refine it into not only a myriad of branching ideas, but a lifestyle, even a doctrine, by which we can choose to be a part of or not.
That's the point.
It's not the cult that matters, more the individual.