Of course they are, but the more important point is whether out of 100 children of religious parents, 0 or 10 or 90 or 100 are likely to be atheists themselves.
I would expect that in most secular cultures you'll see something like, say, 60/100 children of religious parents becoming atheists, and 90/100 for children of atheist parents.
These kinds of dynamics would still mean that overall, even if religious people are having more children than atheists, the population is still growing more atheist with each generation.
I would expect that in most secular cultures you'll see something like, say, 60/100 children of religious parents becoming atheists, and 90/100 for children of atheist parents.
These kinds of dynamics would still mean that overall, even if religious people are having more children than atheists, the population is still growing more atheist with each generation.