That and the fact that religion relies on having a THEM that US can consider the enemy. Kids nowadays are connected to each other, even around the world, more and more. And that’s not good for maintaining Us vs Them.
This interconnection via the Internet and media may alert the kids to be skeptical about their pre-chosen (parents dragging them to church) belief but it's more than pounding dogma into their heads. We are already programmed to think us vs. them and naturally seek the acceptance of the group and find a place in it, whatever that group may be, and will usually remain loyal to it. Groups are confronting and that is partially why IMO church doors will stay open. The kids are still grouping themselves but in a different context and with Skype they can communicate visually now. That's helpful for the exchange of ideas but won't alter our need to belong to a group and family ties are very strong, compelling kids to "stay with faith of their fathers" . Look at the mega-churches, the traditional cult like communities (Amish, Hutterite, ammonite Hasidic Jews) the split offs like mormonism, supposedly the fastest growing, mainstream sects too numerous to mention, scientology, Evangelical groups that incubate the southern kids and the fundamentalist movement in general. Suffice it to say that religion won't disappear anytime soon as long as it gives a kid an identity in a group. IMO we need more skeptic groups for them to join. Like minds like like minds.