In the USA, Canada, and Europe, yes. In Africa and South America? Not so much, and those are the continents where the most population growth is happening. Globally, the number or atheists is not rising as fast as the number of theists. Fortunately, religion is (mostly) not genetically inherited; I have some hope that Europe and the USA and Canada will have some influence in that regard; along with internet growth in those regions.
I'm not anti-Christian. I'm anti-stupid.