Islam of course. Islam is the real devil (also more practical than the Communism),although the Communism is the Islam's ally. Before the collapse of USSR,Communism was a more practical enemy than now,but it was back then (at least the way I look at this insane crap).
Mussies have no fear of suiciding for their goal (faith),which you all know. However,the Commies are afraid of that (at least now). Also,they are totally not afraid of using nuclear weapons (unlike the Soviets,who didn't want to fight America because of the fear of nuclear war).
p.s: correct me if I have spelling/grammar mistakes.