Jom's argument, Khandro, surely, is that an uncritical belief in authority such as Christianity promotes makes it easier for a Hitler or a Stalin. The Catholic church in Western Europe and (some suggest) the Orthodox churches in Eastern Europe have not been obvious bastions of "Christian" morality against the various nationalist movements responsible for the slaughter of the Jews under the Third Reich and later, following the dissolution of Yugoslavia, the persecution of the Muslims of Bosnia etc.
Thanks to whomever it was who, on a different thread, recommended Stephen Law's "The War for Children's Minds". The book is an argument for liberal moral education, and, by extension, an attack on education based on deference to authority. He cites a Professor Glover who investigated opposition to the Nazis: "If you look at the people who sheltered Jews...they tended to have a different kind of upbringing...to have sympathy with other people and to discuss things rather than just do what they were told". And Glover's conclusion: "..teaching people to think rationally and critical can make a difference to people's susceptibility to false ideologies".
Regarding your question, I don't really think much of an Atheist Alliance. I do remember de Botton, whom you've quoted recently, advocating a Temple of Atheism some while ago. And I don't think much of that idea either. I do however subscribe to a secular agenda which would ban faith schools not private religious teaching before anyone complains) and have a religious instruction syllabus which would teach children about all religions. We could speculate how better the situation in Northern Ireland might have been if that single secular policy had been enforced. What would SandyRoe think, I wonder?