From my experience on other religious forums, when I've offered Buddhism as an alternative faith to Atheism, they've rejected it. When people are about to become Atheists, and I propose trying Buddhism before they turn their back on religion, they ignore it. And when Atheists have realized they have found religion, they hardly ever become Buddhists.
It's kinda a regional religion or something. Or maybe there are just too many sutras to keep up with. I'm not really sure.