I wonder if you can confidently predict what a believer's world view would be in this case.
I'm not predicting every believer's world view, but I've run across the mindset quite a bit, that atheists are atheists because they're angry
at God. Of course some are, but I don't think it's the majority.
It's not really unusual, psychologically, for people to prefer being hated to being ignored or, in this case, for some theists to believe that what they care about is hated rather than ignored or not taken seriously.
It's not that I expect atheists or anyone else to be angry at God - only that I've experienced anger that can't really be directed at anything more specific than "the universe." Sometimes I talk to this entity, sometimes I yell at it.
When non-theists are angry is it always at something tangible?
Oh, definitely, I think non-theists have the same kinds of frustration/anger at the universe, life, etc. It's just that they don't personify it as a sentient force deliberately trying to harm them or refusing to help them.
Those vague feelings of anger at bad luck, the unfairness of the universe, or whatever, that all humans feel occasionally, might actually be one of the things which helped spur the development of religion.
Since humans are always seeking explanations and causes and looking for patterns, it can feel better to make up a specific cause, than to accept that some bad things happen randomly. Being able to pray about unsolveable problems gives back a sense of control, and imagining bad people being punished eventually, gives a sense of fairness and order. The way we're hard-wired to try to solve problems and understand things, it's actually harder, in my opinion, to accept randomness or "bad luck" than to make up and believe in a relatively straightforward explanation and solution.