Not that it surprises any of us.
Rabid atheist or staunch Christian... all the same to me,
just points to an overtly emotional bind between the person in
question with the 'thing' he stands for. Irratio
The bind between Atheism and Paganism?
There isn't one. It's just that some Atheists ( and Agnostics?

)
find that Paganism is something which reminds of the days when
humanity was 'younger', uneffected by totalitarian faiths, institutionalized belief etc.
Some of us know that it's mostly a wrong opinion, but still, I'm more sympathetic
to a religion which developed from the young humanity's fascination with
nature, than religions which developed in societies which were terrified of nature.