As a group, atheists have a name, but that doesn't make it atheism a religion in any sense of the word 'religion'. Support groups can be of many different sorts for those who need them, not just religions.
And SCOTUS decisions are not binding or relevant to the 95.5% of the world population which is outside the US, I am baffled that you would think otherwise.
just to get this straight from a few of you on here. If say SCOTUS does rule atheism as a religion, would that make atheists outside of USA hate other atheists for accepting it or 'using' it as a religion? Once a country like USA has made it public - which we are doubting atm due to lack of source but evidence of a man using it in a court of law - the rest of the world could pick atheist apart because you have divided yourselves. Where as say Christianity for example, not started/ruled by court is not divided but China for one, hunts done churches and closes them.