Where's the fun in that?
Ok, honestly, I'm pretty tenacious about reading things before I address them, and I've read a great deal of anti-religious material from Voltaire, Nietzsche, Freud, Russell, and all the rest. Reading Marx is not high on my list, however, because there's virtually no one left who takes him seriously outside a few pockets of left-wing academics. His approaches to psychology, history, economics, government, and almost everything else turned out to be flat wrong. This is evidenced by many things, but most clearly by the utter failure of those countries that tried to build a society along the lines given in his books. I may read a bit of Marx for historical interest at some point, but certainly not for any other reason.
