I see. It probably works best if you think of it as an umbrella term really. I *personally* think a sense of place is important, so for me paganism reflects my own landscape, seasons, myths, folklore, history and culture. But that's just me.
"Umbrella Term"!
Oy Vey! Ain't that the truth?
JK, it has come to be that just about anyone who is not part of one of the mainstream religions, and I include in that Sikh, Hindu, Ba'hai, Buddhism, etc. and infinitum, or atheist is lumped together as Pagan. Goddess help us it now even covers those who identify as Jedi and Sith and the Flying Spaghetti God!
There is a saying about both witches and Pagans (I'm both) that if you ask one hundred pagans or one hundred witches the same question you are likely to get one hundred and fifty different answers and each is going to be as valid as the next. Paganism is THAT diverse.
To answer your question as to what is paganism I can answer only for myself. I have, as previously stated, detailed what I believe and in what I believe only to have the Fundamentalist Christian Mafia attack from all sides, including Finland and Canada as well as the UK telling me that what I believe is NOT Paganism.
What they mean, of course, is that what I believe is not what THEY believe Paganism is. Paganism as you can see from Rhiannon's posts, a very personal belief, it is one that Christians do not understand because, as you have seen from Rhiannon’s posts, it is a very personal path and not one that has a Book of Thoughtless Obedience to tell you exactly what to do and how to do it and who to do it to.
Paganism is a path that recognises the diversity of humanity, that recognises that, in religion, "one size fits all" is rubbish.