That's an interesting point which got me thinking. I guess religions don't have a firewall against memes that don't compete with them. But if you've ever tried to convert somebody, once you start questioning their core beliefs those firewalls are very obvious.
(I do understand some people may find this offensive, as Atheism is considered immoral or unpatriotic in the US and other countries. I'm not making moral claims about atheists; I am one - but the "death of God" did seem to lead to new secular philosophy/ideology, some of which was dangerous.)
