Atheists have a pretty comprehensive website at
http://www.atheists.org/ I guess this answers my question about the atheist message. Their proselytizing is much more involved than I thought:
About American AtheistsSince 1963, AMERICAN ATHEISTS has been the premier organization laboring for the civil liberties of Atheists, and the total, absolute separation of government and religion. It was born out of a court case begun in 1959 by the Murray family which challenged prayer recitation in the public schools. That case – Murray v. Curlett – was a landmark in American jurisprudence on behalf of our First Amendment rights. It began:
"Your petitioners are Atheists, and they define their lifestyle as follows. An Atheist loves himself and his fellow man instead of a god. An Atheist accepts that heaven is something for which we should work now – here on earth – for all men together to enjoy. An Atheist accepts that he can get no help through prayer, but that he must find in himself the inner conviction and strength to meet life, to grapple with it, to subdue it and to enjoy it. An Atheist accepts that only in a knowledge of himself and a knowledge of his fellow man can he find the understanding that will help lead to a life of fulfillment."
Now in its fourth decade, American Atheists is dedicated to working for the civil rights of Atheists, promoting separation of state and church, and providing information about Atheism.
The organization was founded by Madalyn Murray O'Hair, the noted Atheist activist, as the result of her successful battle against mandatory school prayer and bible recitation. Over the last thirty years, American Atheists has:
* Fought fervently to defend the Separation of Religion from GovernmentAppeared in all formes of media to defend our positions and criticisms of religion and mythology
* Held Atheist conventions and gatherings throughout the United States, including "Atheist Pride" Marches in state capitals.
* Demonstrated and picketed throughout the country on behalf of Atheist rights and state church separation. The organization has marched to defend the rights of intellectuals such as writer Salman Rushdie, protested the use of government funds to support public religious displays, and conducted the first picket of a Roman Catholic pope in history.
* Published over 120 books about Atheism, criticism of religion, and state/church separation.Published newsletters, magazines and member-alerts.
* Built a broad outreach in cyberspace with mailing lists, an ftp and web site, FaxNet and other projects to keep members and the general public informed.
* Fostered a growing network of Representatives throughout the nation who monitor important First Amendment issues, and work on behalf of the organization in their areas.
* Grown a network of volunteers who perform a variety of important tasks in their community, from placing American Atheist books in libraries to writing letters and publicizing the Atheist perspective.
* Preserved Atheist literature and history in the nation's largest archive of its kind. The library's holdings span over three hundred years of Atheist thought.Provided speakers for colleges, universities, clubs and the news media.
* Granted college scholarships to young atheist activists
http://www.atheists.org/about