That Is Their Choice
All children are born without the ability to do simple math or read an analog clock. And now, many grow up still unable to do these things. That is nothing to boast about. If they grow up without any notion of religion, why is that something to boast about?
Why is ignorance something to be proud of? If I reject something I know about, that is my choice. But if I reject something my parents never taught me, that is THEIR choice.