Atheism isn't a religion, because atheism does not require faith. It takes no faith at all to not believe in a god. It just takes a lack of evidence.
Fairy Land iv
by William Shakespeare
WHERE the bee sucks, there suck I:
In a cowslip's bell I lie;
There I couch when owls do cry.
On the bat's back I do fly
After summer merrily:
Merrily, merrily, shall I live now,
Under the blossom that hangs on the bough.