Comparing Religion to Fiction...

I am a real big researcher of religion, mythology and folklore, and was wondering what the people of this group think about past practices followed by our ancestors and comparisons to the works of H.P Lovecraft.
I already know about the pseudo-theological tie-in's with christianity and such books that deal with Cthulhu being the 'devil', or having that imagery. But this is my theory...
Christianity, along with other religions, can be tied in with one-another (either through conflicts or shared ideas), and many fictional books can be tied with the practices or teachings of these religions in 'low-key' ways. But what about a book that is noted in a fictional story? Can that be tied into one of these worlds past religions?
The Necronomicon was noted to be false and itself fictional by the creator of the stories that revolve around it, Lovecraft. But according to a book, self titled The Necronomicon by Simon, the book is real and was based off Sumerian myth.

Link : search.barnesandnoble.com/Necr…

I picked up this book, being a real translation or hoax, in order, or to hope, to understand the horrors people felt after reading it. I haven't finished it, but so far, unlike Lovecraft's stories, this is more a using Sumerian mythology as a means for spellbinding and casting rather then the Elder Gods and the Ancient Ones.
But here is my question, before I decide to go through with my story's idea and be ridiculed for its ridiculous idiocies; Could I use the ancient astronaut theory to combine it with old Sumerian myths (keeping in tact these 'incantations' and symbols used by Simon) and fit it around Lovecraft's vision of the Necronomicon?

This was the full idea of my backstory, and I wanted to know, If I can somehow pull it off, would it still be acceptable to the Lovecraft community?