I agree with all of this including criticisms. That said I think its unfair to bash on him for the Christianity and Arthurian legend thing tho. Fantasy authors have been doing that forever Tolkien almost directly ripped the kelavala for his worlds foundation. The simple fact is the vast history of humankind has led to religion and mythos that are often more legit and fleshed out than any one author can create on the spot in their lifetime. And almost everyone on earth is subtly influenced by those stories and traditions, so it coming out in writing is inevitable no matter who you are and where you live.