All of this to let the player know that, in this game, "God" is a character who is regularly insulted (in a vulgar way popular in japan by rebel teens) by some "angels". So I don't know where the author lives, but expect all monothetist  players to be indirectly insulted as a regular basis. 
Insulting the beliefs of million of people is legal, no problem.
But just maybe you'd want to add a warning about the content on the catalogue page not to come out as rude.
That's why I rate it low, otherwise I'd have given two starts at least not to let your personal beliefs impact my opinion.