I invite believing Pagans to define paganism and hope that some will do so here. I am pretty certain that any time a non-follower describes any tradition, without at least the active presence of an actual believer or two, something bad is bound to happen. Any doubts? Think about how Judaism has been mangled over the centuries by non-Jews twisting it to meet their needs for a spiritual foil.
My guess is that is what Newt was doing with paganism, and since it's no longer acceptable in most quarters to do that with Judaism, he simply picked on another group which has fewer defenders. It was wrong to do to Jews, and it's wrong to do to pagans.
My thanks to Jason over at The Wild Hunt for the link. - sm