No way there are 40-50 million atheists in America.
Atheism is at least as much faith based as Christianity. I see the world around me. That’s an effect. It causes me to wonder about the cause. An atheist would believe in spite of all the evidence that there is no God. Now it’s possible all of this is here for no reason whatsoever, but what is easier to believe? Is it easier to think we’re simply machines in a universe without a Creator or that the universe had a cause, a Creator, who used various means to reveal Himself to us? It’s impossible to prove either belief, but I find it much easier to believe the latter because it better fits the world I experience around me.
Agnosticism, in my opinion, is the only possible non-faith based position. One cannot prove with absolute certainty that there is or is not a God. However, as I wrote, that doesn’t mean agnosticism is right. I’ve never been to Russia, for example, but I’m pretty sure it exists. I certainly couldn’t prove it exists, but I see evidence that implies it exists.
That’s why I’m a Christian. There’s a written record of Christ’s existence, and He said things that seem very plausible to me. There were other people who witnessed Him in person. The way they lived their lives after the encounter lend even more credibility to what was taught. I also see the impact in my own life of how much better it is to make peace with God through Christ. Sure. I’m acting on faith and cannot be certain it’s all true, but it’s the best explanation for man’s existence that I know.