I noticed John Loftus objecting to my comments by, typically, bringing up Scandanavian countries. However, PL's point is relevant here, that strong secularization tends to move a country toward underpopulation, which makes it difficult for them to avoid a Muslim majority. And, I would also have to make the note that the secularization of those countries took place with very little of the religion-bashing typical of new atheism. If religion dies within a culture, I think it is more likely to die of neglect than anything else.
There is a sense in which writing books like the God Delusion and running websites like Debunking Christianity is a self-defeating enterprise. What you are saying by doing that is that God and Christianity are so important that someone needs to take lots of time and effort attacking it. I know they don't intend to leave this message, but that is still the effect. These people spend a lot of time and energy on what they don't believe, in debunking the wrong answer. If it's really worth the time and energy to criticize something, then there are rules, such as the principle of charity, that have to be followed. If not, then you are better off pursuing the right answer than attacking the wrong answer.