A quick 'ready reckoner' breakdown for OP and his ilk (cut out and collect!):
It's interesting to note that going by the reckoner, something like, say, Marxism would probably count as a religion (specifically an apocalyptic movement), while stamp-collecting, the absence of stamp-collecting and, naturally, atheism would not. The list isn't exhaustive, and no one item is necessary (I don't think Jainism has a founding figure), and Buddhism is going to be awkward, but isn't it always?
And yeah, I've often wondered why a certain section of the theist community seems to think it would be some kind of 'victory' to have atheism classed as a religion. Implicitly, the line makes membership of the category 'religion' a negative, a reason to dismiss. I suppose it's ultimately just another mirror chess tactic, and doomed to the same failure as all of those.
That said, there probably are people for whom 'devotion' to atheism fulfils needs other people fulfil through religion. But then ditto genealogy, astronomy and a host of other things which, interestingly enough, no-one ever tries to claim are religions - which is exactly how you know that theists pushing the 'atheism = religion' idea have impure (and probably inconsistent) motives for so doing.