[@SleepingSilence]

I wasn't a kid when I left the church, I was 25, maybe 26. I had a firm grasp on my beliefs (or lack thereof) at the time and a few years later, nothing's changed. 

And I believe that atheists (at least here) aren't as outspoken regarding Islam because it's not the main religion running the country. Sure, it's one hell of a problem in many other nations, but not here. Atheists in, let's say, Saudi Arabia sure do try to fight their battle, but then they get killed. Atheists here battle the main religion, Christianity. Not as huge of a problem as Islam, but let's not kid ourselves, we're not living in Sweden or any of those glorious countries where they don't gotta worry about anything.

You see, religion is a lot like sports. You're born in America, you're more than likely to be Christian and a football fan. You're born in Japan, the chances of you being Buddhist and a fan of baseball (they love it there) are damn high. It's all situational. And the beliefs continue on to adulthood. They believe what their parents and society tells them to, not what they feel is right. I'm not saying that's the case for every single person, but the ones that go against the flow are a few and far in between.

As far as the origin of the US, I mean yeah "thou shalt not kill" and so on. I'm not religious but I don't go around murdering people. Christian ideals, sure, but not necessarily the Christian religion itself. It's written in the Treat of Tripoli (Article 11). It was just over a half century ago that "God" was implemented into the pledge and IIRC, currency as well. It wasn't always like this.