Atheism on the decline? Why?

It has atheism at 2%, and not marked as declining. You might be looking at "no religion" which isn't necessarily atheism. I'm not bothered by it at all. What other people do in their spare time, as long as they don't try to make it affect me, doesn't worry me. If everyone else on earth decided to become Zoroastrian, it doesn't mean I have to do so.