In Granblue Fantasy episode 4, the villain accuses the general populace of forgetting their goddess, to which he has provoked into causing a problem (I left it vague to keep out the spoilers).
How does a society "forget" living and active gods and goddesses? In many works of art, I see that they old religion gets replaced by a new one. Sometimes that new one is monothiestic. I see no evidence of that in Granblue.