Are you sure about that? If you haven’t read my signature, I’m an anime writer. Fantasy happens to be the genre I mostly write about.

The only spirit I’ve ever channeled is the Spirit of Youth!!!
runs to the sunset (Sorry, sometimes I can’t help making obscure anime references XD).
Anyways back on the issue. I don’t think you can really say that when writing is merely a process of using your imagination. When you create a character for example, you don’t decide which certain spirit has this or that type of personality. You decide everything yourself. What’s her hair color? What’s his archetype? Is she a
tsundere or Miss Girl-Next-Door? Of course there are strong influences such as environment and, heck, it’s even common to base characters on people around you (more often yourself). But channeling? I’m sorry, but I advise you to actually try writing yourself. You might find that it’s nothing really religious/spiritual but merely an enjoyable art.
Ever been beaten by a boss? Totally pwned? Your whole party,
literally, wiped across the floor?
Now imagine that… only an infinite times worse.
That’s what would happen should I ever be able to use magic and tried using it against God. That’s what makes God, God and me a powerful but otherwise mortal. I can only reach level 99. God’s level is
censored due to level number being of extreme awesomeness