The 'official' pool is currently up to date, there is no need to register, just enter the below data in your miner-software and any coins mined will be send straight to your wallet.
Don't forget ATH matures in 80 blocks, so you won't see any coin appear in your local wallet untill 1 hour after you started mining.

Stratum: stratum+tcp://pool.atheistcoin.org:3333
Username: your AtheistCoin address
Password: anything

Note: Mining in the official pool helps ATH stay alive, we take a tiny fee and use that to fill our development/hosting/give-away fund.
However this is not nearly enough, (I guess we were to fair for our own good,) so if you would like to help us out, please donate some to the address listed in OP.