In general, I find the word "pagan" to almost always be used pejoratively, as you did. I'm sure Muslims consider Christians to be pagans and vice-versa. And I'm absolutely certain that dubs consider the entire planet saved themselves to be pagans.
I really doubt that.
One of the names used for Pantheism is Rational Paganism. I some times call myself a pagan. I am not being pejorative. Wicca is an example of paganism. So are the many polytheistic belief systems that you are talking about, but it is not limited to them. I would guess that you wouldn't consider any native american spiritual systems pagan. However i would. I'm sorry buddy but your attempt to limit "paganism" to mean only and just what you want it to is your own problem not mine.