Numbers are numbers, and Paganism has been slowly growing to numbers that are nothing to scoff at. In England and Wales, Pagan adoption has grown to 71,000 following 2021 census statistics (17% increase from 2011) and Christianity has fell 13% since 2011 following those same census statistics. America is much of the same in Christianity's decline, although Paganism is still only at a mere 1% adoption rate.
To put it shortly, Paganism is slowly but steadily on-track to overtaking Christianity in certain European countries. It might not be a threat today, tomorrow, next year, next decade, but it'll certainly snowball into an issue come 2040. Atheism on the other hand is already a major issue and will continue to be until Christianity withers away much like every other religion that merely defined an era, rather than forever. Of-course if current statistics are to be believed, who knows what the next generation will make of it all,