I would suggest that atheists are not struggling against God but against the tendency of man to believe in God. If you've ever found an aspect of mankind to just be totally unpalatable -- say, you're fed up with people being greedy, or ignorant of politics, or you disagree with an accepted cultural practice like drinking alcohol or eating meat -- then you know what it's like to feel that you need to protest the status quo.
"Angry" atheists are generally people who hate the tendency of man to believe in something he was taught by his parents, who were taught it by their parents, etc. They refuse to accept that people should be allowed to be so gullible. They see religion as the cause of many of man's problems and want to make it go away as soon as possible.
None of this has to do with any one particular conception of God and it does not require the atheist to believe in any such God, only to believe that other people believe in him/her/it.