There is growth of paganism in at least some parts of England. It’s ironic that 2000 some years after Christians defeated paganism, it lives on.
I know almost nothing about paganism, but my impression is the pagan experience is light hearted and fun. Like Native American faiths, it is earth based and features rythmic drums.
While one can’t say paganism represents a threat to Christianity, the big numbers are still with the Christians, we can speculate about what Christians need to do about it. I’d suggest they need to find a new “Paul”.
Paul of the Bible was a marketing genius. That is, he was able to change the Jewish faith in a way that made it more marketable to pagans.
There are evangelists in the U. S. who are operating like Paul. They are taking the heavy lifting parts of Christianity, sin and hell, and setting them on the shelf to be ignored.
An example is Joel Osteen whose sermons skip over sin and hell and focus on success. It could be that sin and hell are like the circumcision of Old Testiment times. People didn’t like it.
But, the Osteen approach may not be enough. My theory is the oldest and most enduring religious messages are nature and earth based. I think the reference to gods in the sky is merely a temporary blip in hundreds of thousands of years of religious thinking.
Maybe that is why pagans are retuning and again planting churches.