So Cassandra Clare has decided to stop wanking over Clary and Jace’s forbidden long enough to wank over how much better Shadowhunters are than us paltry humans. Just to amp up her anti-human sentiment that oozes from every word of her series so far.
By the way, no this is not the language of Heaven. It would be one thing if Clare implied that the runes are the language of all the Angels, much like Enochian language proposes to be. The television show, ‘Supernatural’ and many other tv shows, movies, and books have actually taken Enochian which is a mostly debunked language and added to their to world building.
With the Raziel’s runes, however, the runes are simply Raziel’s own language. Yes, Raziel is an Archangel, but the runes do not come from not from God but from Raziel himself. And as God is the creator of Heaven, this does not make it a heavenly language. Seriously, Cassandra Clare largely omitting God from her canon, while still using Angels continues to bite her in the ass.
Clare clearly wants her cake and wants to eat it too. She wants to use Angels, but not adhere to the core parts of that mythology/theology. Clare needs to make up a totally original supernatural being or stick to the core parts of the mythology/theology. You can’t have it both ways.