I have the same view of Slavoj Zizek that you do, roughly: he's much overrated, and generally full of himself (he's the media's idea of a philosopher, but decidedly not the genuine article). He's Marxist to the core and he's an atheist. The only remotely positive thing I can say about him is that when he writes about Marxists and the Communist world of 1919-92, he seems generally to know what he's talking about, even while he is sometimes appallingly uncritical.

But I disagree with your suggestion that the rise in religiously-motivated violence is limited to Islam.