Welcome, Blake. You'll find a lot of atheists here, many of them completely at ease with their non-belief (I am one). Some have fascinating de-conversion stories; others, like me, are life-long atheists. I guarantee you will find many with whom to discuss your experiences. I hope you enjoy your time here!

λάθε βιώσας, I need to dispel you of the notion that the USA was founded as a Christian nation. It was not. It was expressly founded as a nation intended to be free of religious persecution of any kind, in response to the yoke of English (Anglican) rule. The Constitution was not written with an intent of an official or "true Christian religion" in mind, as you assert -- not at all. In fact, just the opposite. Unfortunately, there is now quite a successful meme that is was, however, thanks to intentional and focused Christian revisionism.

λάθε βιώσας, I need to dispel you of the notion that the USA was founded as a Christian nation. It was not. It was expressly founded as a nation intended to be free of religious persecution of any kind, in response to the yoke of English (Anglican) rule. The Constitution was not written with an intent of an official or "true Christian religion" in mind, as you assert -- not at all. In fact, just the opposite. Unfortunately, there is now quite a successful meme that is was, however, thanks to intentional and focused Christian revisionism.