Cthulhu is fictional entity from H. P. Lovecraft.
There must be witnesses of God in reliable historical documents.
And even if Cthulhu was real, if you worship Cthulhu, you cannot worship God.
It's from my current understanding. I read Bible and some other materials(not intentional to fictional) since 2018.
@Acer @PNS I would argue that the historical evidence for the existence of any god is about as sold as the evidence for the existence of Cthulhu, which is exactly why we call it faith instead of knowledge, but then, what do I know ;)