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What do you make of the notion that fundamentalist Christians and dogmatic atheists have in common an intolerance for uncertainty?
I haven't read the previous six pages of responses, mind, so someone might indeed have said what I'm about to say.
1. There is no such thing as "dogmatic atheism". Dogma is a set of beliefs held to be incontrovertibly true. Atheism is a lack of belief, so therefore it has no dogma. You cannot be a fundamentalist atheist. It's impossible.
2. You'd have to be 100% certain to devote your life to going to church every Sunday to eat stale crackers, reading the Bible, learning about Jesus, emulating your life after Him, praying endlessly, and singing that God-awful gospel music. If anyone has an intolerance for uncertainty, it's all theists (not just the fundamental ones). Now you could point to those Christians who genuinely believe in God, but do none of the above. However, if you really believe that an all-powerful God created the universe and is watching your every move and has the power to roast your *** in Hell for eternity if He doesn't like you, if you don't get up off the couch every Sunday to try and appease Him, can we really say you are set in your convictions? You're probably a theistic-leaning agnostic who hasn't put much thought behind it (if we had to give you a label).
3. Most atheists, at least in my experience, are not 100% certain that God doesn't exist (they're agnostic atheists). Not even Richard Dawkins, the Pope of Atheism Himself, is 100% certain. Atheism is a rejection of a positive claim. If you claim to have an invisible pink unicorn tied up in your front yard that only you can see, that claim is unfalsifiable. You can't really prove it exists to me, but nor do I have sufficient evidence to accept it. If I reject the claim that you have an invisible pink unicorn tied up in your yard, that's not being "dogmatically certain". That's saying "Come back when you have some evidence." Atheism, by definition, cannot be 100% certain because it is the rejection of an unfalsifiable claim. To be 100% certain is to take a minuscule leap of faith and assume that 0.000000001% likelihood of God existing is false, but it's still not a position based on evidence. That would be a positive claim requiring evidence and that's why many atheists (from a philosophical standpoint) reject the notion of 100% certainty. Those atheists who claim to be 100% certain still mostly acknowledge they're taking that minuscule leap of faith.
4. To be an atheist doesn't require certainty. Since atheists are not making a positive claim (such as "God exists"), atheists have no burden of proof on them to falsify the existence of God (which is an unfalsifiable concept anyways). Agnostic atheism is the most logical and rational position. If you don't have evidence for the existence of God and think it's highly unlikely (like our pink unicorn example) because it's so uncommon with our normal experiences, the logical and rational thing to do is to reject that claim until sufficient evidence is produced. Likewise since sufficient evidence for God hasn't been produced, and since a supernatural being is so uncommon with our normal experiences, the logical thing to do is to reject that claim until sufficient evidence is produced. Until that point, the claim will stay in the "I guess it's possible theoretically, but extremely highly improbable..." basket in the office at work.
5. As an aside, although the question didn't explicitly say it, I'm wary of these types of questions that try to create a false equivalence between fundamentalist theists and anti-theists. The question may not be couched in these terms, but usually the underlying purpose is to try to establish a commonality as a basis to claim moral equivalence and invoke a "tu quoque". With a mark against each side, we can all agree to disagree and nobody has to actually present evidence for the beliefs they claim. Now that may or may not be the intent of this question, but it is an eerily similar line of question to these types of arguments I've seen in the past. While anti-theists can be annoying, people who are annoying on the Internet are in no way the moral equivalent of gay-bashing, abortion clinic-bombing, militia-forming fundamentalist Christians. Full stop.