[derrida]

All I'm saying is that King could have done more to distance himself from people who defended Mao Tse Tung, and, in failing to do so, brought some amount of taint upon his legacy.

I'm not sure why you're bringing up King's Christianity (if you know about he personal life, he probably wasn't fit to be a minister) as if it precludes any association with communism. No, King wasn't a peddler of the "opiate." I'm sorry but I don't want to believe that a Marx quote you read somewhere is your sole justfication for assuming that Christianity is at odds with communism, especially when Jesus said essentially the same thing (in reference to the Pharisees, in case you forgot). You're welcome to argue that Marx was talking about faith itself, though.

"Die Religion ... ist das Opium des Volkes"