I've noticed that a lot of people here are talking about what they believe in as if it has no bearing or consequences on those around them and act surprised that the non-believers act so aggressively to call out those that have beliefs based on a theistic world view. "Why can't you just let me believe what I want, it doesn't effect you....." To the contrary I submit that beliefs do matter as they are the foundation of how we act within the world and depending on the beliefs you hold, can have a significant influence on others.
When we decide to act, a belief that something will cause harm, or prevent it, that something will promote health and well-being or suffering. These things matter and why it's important for everyone to base their beliefs on things that can be show to be true via evidence. Evidence using the scientific method is the single most consistent way to remove our feelings on a subject.
So what about my beliefs, are they all grounded in solid irrefutable evidence? Can everything that I believe be shown to be 100% true? Perhaps not as much as I'd like, I suppose that almost anything can be refuted to some extent, but when I chose to believe something that has questionable evidence I consider how that belief affects my actions. What kinds of consequences do beliefs have on the world and other people in it? That said, my consideration of belief in things that cannot to be show to be true is directly proportional on how those ideas affect my actions.
Let's take "the big bang". How does belief in this purported phenomenon effect my actions? I can't think of a single action I've taken based on that belief that has affected anyone else. Well, unless I've used the evidence of the Big Bang to refute specific religious claims. In which case I simply weigh the evidence for both and believe the one that has the greater evidence.
Why do you believe that killing is wrong, stealing is wrong, that deceit is wrong? These are concepts that are reasonably simple, because they have direct consequences that most of the time result in some type of harm.
But what about abortion, taking birth control, being GLBT? Beliefs do affect what other people want to do. If your reason for thinking that any of these things is wrong is based on your belief in a god and what that god has to say about such things, I submit that your beliefs do affect the world and when people attack you (figuratively, not literally) please don't be surprised. You are entitled to believe whatever you want, but when when you carry those beliefs out into the public sphere and you are asked to provide evidence and the rest of us call your ideas "magic thinking" or just downright false, please don't be surprised.