How? There's this thing called Freedom of Speech. If you're American, it's included in the FIRST Amendment of the Constitution, so you'll find it very quickly.
"Real" Christians need courage, for what? You also have freedom of speech.
In America, the Religious fundie Right is making itself heard all the time.
I've been an atheist for a couple of years now, and I have no problem with other people holding different beliefs than I do. I think it's a case of projection, dearie. YOU want us to not exist, so YOU think that WE want YOU to not exist.
Most Swedes are non-religious. We still have YUGE churches in every little hamlet, and many teenagers still go through Confirmation (mostly for the gifts afterwards). People still hold weddings and christenings in churches, and we celebrate Christmas (though we call it "Jul"). How is this making the very existence of Christians an offence? Apparently we have 6,1 million members of the Swedish Church, in a country of 9 million people!
Here's the one in the village next to mine; Skänninge, population 3358.