This is of course, true, but also not true. I am convinced that there are a LOT of closet atheists. Much like the fact that there were no more gay people in the 1950s, they just hid. In 20 years, it will not be something to hide. When someone asks me about religion, which people still do in polite conversation, they are almost always appalled when I tell them that I am an atheist.
My son goes to cub scouts. I go to events with him, but I am barred from being considered a den leader, and cannot serve in any official capacity. To be involved in the BSA, you have to believe in a god. You can believe that he is a purple unicorn, or that he has 8 arms, but you HAVE to believe in a god. In-fact, membership is barred for only three groups, referred to as the "Three Gs". Gays, Girls, Godless. A boyscout cannot even get his Eagle Shout rank without a letter from his pastor attesting to his moral rightness.
Frankly, I'd trust an atheist before an evangelical christian.
Bill