Good question. The moon is quite symbolic in tarot card reading. The freeper who drafted the crescent moon from the killing map may not have been so far off the mark. The death card - death to who? Death to men? women? children? the elderly? whites? blacks? hispanics? asians? Or simply put -- death to Americans. I wouldn't so readily dismiss the recent al qaeda threats. Who ever is doing this is a ruthless trained killer, such as one might find in a training camp in Afghanistan
Even if it did say 'God' that doesn't rule out that this could be a guy affiliated with Muslim terrorists.
'Allah' is just as generic a term for God as 'God.' But the comment about the guy in the movie being called 'God' I found interesting (haven't seen the movie yet).