User blog comment:RunicVamp/Source of Magic?/@comment-3045936-20151029223007/@comment-9249716-20151030050527

In regards to Pagans, there's one of two ideas:

1. they are psychci manifestations that came from humans believing hard enough that they existed, or

2. they were originally divine spirits that God assigned a facet of the physical world, e.g. lightning, but they broke away from god's command because they loved mankind's worship from them, and tried to force mankind to worship them for fear of death.

As for witches, I think iron is only a weakness for ones using black/demonic magic. In terms of the show, anything considered supernatural, be it magic or something to counter magic can be considered 'magical' but it mainly depends on the use.