Everyone pretty much summed up how it is, already.

I can't say I'm a confrontational atheist. I never really bring it up, and I don't preach to Christians, or any who believe in God...more due to the futility than anything else, really. I've had enough experiences in debate to know that when peoples' religious views are at stake, it's very hard to have a mutually understanding discussion.

Essentially, just a regurgitation of the same arguments until one gets tired of the process.

The only thing I will confront people about is an aggressive religious view, when people start applying their religious views to actual laws that would be applied to every citizen.

Oh, and call me obsessive compulsive:
Actually, we knew the earth was round long, long before Columbus came around. Since ancient times.

Columbus was just the idiot who thought that the globe was about 1/2 its actual size.

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"True wisdom comes to each of us when we realize how little we understand about life, ourselves, and the world around us." ~Socrates