Possibility #2 - Watch TV.
Possibility #3 - Meet in secular dens to plot how to beat Jesus in ping-pong; as it is written in the final chapter of the Atheist Lible: The Book of Recreations.
Possibility #4 - Kill themselves because of the stark lack of meaning in their lives.
Possibility #5 - Just run around, fucking everything.
Possibility #6 - Lurk.
Possibility #7 - Believe in the miracle of double-blind, controlled, replicable, peer-reviewed research.
Possibility #8 - Joyfully lift their voices upward, but not too high.
Possibility #9 - Find their unique purpose in helpfully canned structures and rituals.
Possibility #10 - Skulk.
Possibility #11 - Continuously deny the existence of a supreme being because they're a bunch of grumpybutts.
Possibility #12 - Abandon their families at the first sign of trouble.
Possibility #13 - Argue for preferential treatment of sociopaths, criminals and politicians who have not found God.
Possibility #14 - Have a hard time texting "OMG!"
Possibility #15 - Bug their physician to refer them to the top soulectomist in their provider network.
Possibility #16 - Invade other countries that refuse to not believe properly.
