"What exactly is his strategy here? If they are beyond reason/help/enlightenment?"
He's helping to create an environment in society where people are given encouragement to start thinking for themselves, and not feel pressured into having to believe idealogical nonsense.
Yes, those who fervently believe will probably never change their minds, but his 'strategy' (or simply 'telling it like it is') will help those that might otherwise succumb to the seductive manipulation of the religious nuts and their organisations.
He might not be able to kill the existing cancer of blind belief, but he is helping to prevent it's spread.
The only other alternative, what you seem to advocate, is just letting them get on with it and hope it doesn't affect us atheists too negatively. But it does, and it has, and it's been too long that we have let them get away with changing society based on something that doesn't even exist, except in their imaginative, but weak-willed minds.
Even if you disagree, calling him an idiot says more about you than him.