Most atheists aren't angry at the fictional character in a book. Here's some things we may be angry at, that you may be mistaking with it:

  • Religious followers trying to destroy science education.
  • Religious followers trying to destroy legitimate sex education.
  • Religious followers trying to use tax dollars to promote their religion.
  • Religious followers covering up pedophilia scandals (and the pedophilia).
  • Religious followers trying to suppress civil rights
  • Etc.

In a sense, the god character is grounds for a proxy war, because whenever we confront the religious people harming society, their god is cited as a justification. Therefore, we fight about the god, the holy book, and the doctrine. That's apparently seen as us being angry with their god... instead of being angry with them.

For those who "deconverted", a bad experience may be a catalyst, however, mostly they stop believing as they evaluate the evidence (or lack thereof), over a long duration of time. This may lead to additional points of anger, once they realize their theistic beliefs were unjustified:

  • Anger about being lied to, or mislead, by your parents all your life.
  • Anger about having wasted your life being oppressed by a false religion.
  • Anger about having ever supported a regressive, evil organization.

Many theists like to believe that atheists are just having a juvenile, emotional, knee-jerk reaction to a bad experience, and don't really disbelieve - just rebelling.

For many atheists, this simply isn't the case. We ultimately arrive at our position through logic and reason. Some become atheists for emotional reasons, however, they typically "bounce back" to theism after awhile.

Often, those who are skeptical in nature just tend to question the doctrines and dogma. When it doesn't add up, they begin to doubt it more and more.

Anger isn't a prerequisite for disbelief. As a theist, ask yourself why you're mad at Zeus or Thor. The answer is that you're not. Other, more rational reasons exist for not believing in a supernatural entity.