I think about what you're saying here a lot. I feel really bad for them. Even though I'm not a big fan of religion, I could play devil's advocate and say, "If the religion helps them by bringing hope and joy to their daily lives, then let them be happy." Even still, I'd stick to my true belief and say, "Indoctrination is evil because it is forced, and has much wicked, fear-based dogma in it." So, to me and many others to which you were pointing out, I empathize greatly. People do grow up and begin to question things, but they're in a family who "knows" their religion to be true. You can't speak out in a lot of cases, including mine, because people in your family will never look at you the same again, or they may actually dislike and alienate you. As the popular saying goes, which I'll rearrange to my liking, "Religion deludes people, divides people, and controls people."
"That which can be asserted without evidence, can be dismissed without evidence." -Christopher Hitchens- My Hero