Perhaps I should have provided more context from the essay: the criticisms he makes of Lewis' style in Beyond Personality are legitimate, and Lewis himself later owned up to some failings in that regard and revised them for publication. I don't think Lewis would have been angry, but I think he might have replied that Orwell was also an unintentional part of an outflanking movement, but in a battle of far greater consequence. I don't think Orwell is claiming that he knows Lewis' motivations or attempting psychoanalysis: he is saying why the BBC allowed him to do talks. The BBC employed Orwell, and he probably knew more about their internal workings than Lewis, who was merely a guest speaker, could have done. The fact is that the children of this world are wiser in their generation than the children of light, and it's not impossible for politicians to use Christians for their own purposes: of course, the Christians can also understand that God uses the politicians for His own purposes. But it's no good being naive about the politician's own motivations. Orwell doesn't intend magisterial, dispassionate analyses, either: his Why I Write confesses failings, but attempting to be dispassionate was opposed to his principled stance. If he did attempt it, he would have acknowledged that as a mistake.
Also, intellectuals of Orwell's stripe would probably never have dominated: for one thing, Orwell was much too honest to maintain a lot of friendships: so he got abusive letters from H.G. Wells and gave John Middleton Murry a thorough, and deserved, scolding. Also, there weren't a lot of them! Orwell tends to stand in a class by himself, coming as he did from a lower class of society than a lot of the intellectuals, having the courage of his convictions, and having a different range of experiences (Burma, as opposed to university; being a tramp, as opposed to working in a bank): he could get along with Eliot and excoriate Pound. It wasn't until Animal Farm, which he had trouble getting a publisher for because of the offence it might give to Britain's allies, that there was much general awareness of him. You might want to read his articles on the decline of belief in personal immortality as the central crisis of his times, before you clobber him too strongly. With Lewis, he is my favorite writer from the time around WWII, and one of the most valuable of non-Christian essayists.