As an atheist, this has to be one of the most insulting things I've read on allnurses.com in quite a while. China is not "godless", you can look it up in Wikipedia for yourself but about 30% of Chinese claim to be religious. There are many religions represented in China, including Buddhism, Christianity (both Catholic & Protestant), Islam, Black Dragon Worship, and Taoism.
Sex-selective abortion has nothing to do with religion, it has to do with culture and the role of women in each culture. It is mainly practiced in China and India (India by the way has a high proportion of religious believers, Muslim and Hindu). Sex-selective abortion has never been practiced in the west, including in western countries where a large number of citizens describe themselves as not believing in any gods (Norway, Czech Republic, Sweden, Belgium, Netherlands, Estonia, etc.) That has to do with women's role in western culture, not religion or lack of religion.
So you can't even reasonably say it's "not as simple as that," because it is as simple as that it has nothing to do with believing in any gods/religions or not. Nothing.