Most religious believers really can’t even attempt to defend their beliefs and so they get angry at atheists for forcing them to think. If everyone believes in God, then they can continue to live in blissful delusion, but if just one person rejects that belief then the delusion is diluted. The possibility arises that God might not exist. The more people reject the belief in a god, the more religious believers have to accept the possibility that they are wrong and that God doesn’t exist.
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Always Question Authority 
The article fails in many ways. The author states one truth and the possibility that God doesn’t exist. Just an opposite argument to what the theist would say. One truth and God does exist. Two ideas just different sides of the coin.
Yes theists do get angry, but these are always the ones who have no studied their own religion to its intellectual level. Also from my experience atheists always get angry if given intellectual arguments. So the real issue is not whether God exists or does not, it always ends up with who ever sticks to his own ideology. Neither side can prove or disprove God in the physical realm and hence from an atheistic point of view both sides are living in delusion. We came from nothing or nothing will go in to nothing hence existence is “nothing”. 🙂