User blog comment:SayuriDarling/Magnus Chase and the Gods of Asgard Official Discussion/@comment-4902593-20150708051010/@comment-25044056-20150709122021

Umm all of those religions still exist...not as cults either as mainstream religions....so it's not really accurate potentially offensive to call them mythologies.

I think RR is going to avoid making a series about deities who are still widely worshiped.