@Yuyu Deitasterra did purposefully cause the curse, though she didn't spread it, magicians did. Though, from the hints that we got, it seems that it's more like the Followers spread it and the magicians perpetuated it.
Averna, the "saint" was the catalyst since it was her betrayal that sent Deitasterra so deep into despair that she caused the curse. It seems like Averna did it due to being yandere over Calla also something something humanity's fate should only be decided by humans, though it does seem like it's more about the former than the latter. She then declared Deitasterra and the other disciples and magicians as evil, hiding the fact that she was one of them.
So yeah, she both is and isn't being framed.
Averna, the "saint" was the catalyst since it was her betrayal that sent Deitasterra so deep into despair that she caused the curse. It seems like Averna did it due to being yandere over Calla also something something humanity's fate should only be decided by humans, though it does seem like it's more about the former than the latter. She then declared Deitasterra and the other disciples and magicians as evil, hiding the fact that she was one of them.
So yeah, she both is and isn't being framed.