I think Hemingway is overrated but Hemingway being overrated is also overrated. Hemingway is the logical extension of the plain style tradition, stuff like George Herbert, into modernism. His work has a lot of syntactic and metric grace that it is not easy to imitate for all of the imitations that have been made of it. He is also a writer of great, almost embarrassing feeling, once you grasp the style's subtlety and the real import of the events in his works. He's one of those writers who isn't simple stylistically but can be read like he is, so he often is. The same is true of his realism. The thing I agree with is that his thinking leaves something to be desired. Hemingway's exploration of stoicism is real but not persuasive. It is only deep in feeling. The thinking in his writing carries with it the whiff of pretense. It's not quite the pretense we read into it these days, of the manly man, but there is something beyond mere "grace under pressure" - the desire to be under pressure to prove one has grace. Risk seeking, peacocking, and for its own sake, not to make one's fortune, which is the classic American story. He captures the effectiveness of the stoicism but not the way in which people seek in his work out the situations that provoke it, like he did. He's also pretty moral.

I think Nabokov is embarrassed by Hemingway's un-ironic sentimentality, and repulsed by his pretense. Nabokov is a very unpretentious writer, in a strange way, because of his ironies. Nabokov also resists the moral, though he's often accidentally moral, like in Lolita.

It's very late, I hope I'm not being too vague.

As for his god comments... read Speak, Memory.