This is going to be controversial, so buckle up.
To define “authenticity” in paganism, I mean (now bear with me here) “contextual cognitive resonance” in our practices, rituals, and traditions. That means that our rituals, our practices, our stories, are grounded in and informed by the here and now. That when your Paganism is seamlessly embedded with the rest of your life, then your Paganism is authentic.
Conversely, I mean that the more you have to screw your eyes shut and pretend, or envision yourself at Stonehenge, or ignore “Mundania”, to practice your Paganism, the more inauthentic it is, and the more difficult it will be to hand your traditions down to your children.
When you turn your back on the Mississippi River to face west to call “Water”, this is inauthentic.
When you are only Pagan on coven night, or at gatherings, this is inauthentic. (Good on you if your taking your kids along, though.)
If we want a religion that our children will be proud to carry on, we must strive for more authenticity, at our holidays, at bedtime, for our rites of passage, in our values, our liturgy, our stories. We must create a deeper and richer Pagan culture. Uncle Gerald didn’t anticipate ANY of this, and it’s high time we started sinking our religious roots, right here, right now.