According to our samples, about 1 in 3 atheists in our country don't feel comfortable disclosing their lack of belief
Personally, I have zero issues with stating my lack of belief, that being said, I don't go around shouting it from the rooftops either.
I honestly can not understand why some people are embarrassed or even ashamed of their beliefs. My belief, or lack thereof, is not your concern, nor is it offensive to you. If it so turns out that there actually is a god, I guess I'll have to deal with the almighty impudent child when that time comes.