Ever go to a university?
I did. At Gustavus Adolphus College, there were at least twenty or so student groups with the charter to bring people to Christ.
There were absolutely no atheists groups, of any kind, whatsoever. The closest there was was when a friend of mind banded together the Buddists, Muslims, atheists, Jews, and folks of every non-Christian creed to form the "Alternative Religions Society".
Here at Mizzou the situation seems comparable; there are actual organizations for all the major faith groups, many, many Christian outreach/ministry programs; and no atheist groups whatsoever.
Oh, of course, many people
become atheist at university; that's usually as a result of their education contradicting their closeted, blindered religious biases. In other words, the transition to atheism is usually something that you do on your own because your previous faith fails to sync with reality, not because some group brought you over for Atheist conversion. Usually your first days as an atheist are pretty lonely until you find more people of the same pursuasion.
But there are no atheist recruitment groups at any university that I have attended. Contrast that to the vast proliferation of Christian ministry organizations.