What do you think of this fraternal religion for my Occult series?

It will probably sell well. It certainly sounds derivative and insipid enough to appeal to the mainstream. If you wanted to write something brilliant you would have to do something imaginative or difficult like actually doing some research. What would be the point of that? Just so you could tell the story about what the Templars really found in the city of Harran, which is now nearly completely buried by the sands? Why would you want to tell anyone about the Templar chapel which had a floor made of black basalt inlaid with a shining silver symbol? Who would care that it has a twin in the Mosque facing it? Who would be curious about why the two shared the city in peace with each other? Such mysteries would not interest the fools who will read your story - so why waste the effort?