If you ask Dawkins, Hitchens and others, childhood indoctrination in any religion is a form of child abuse. By pushing a religious ideology on a child, while their brains are rapidly developing, you cause children to ignore logic and critical thinking. I don't see this as much of a problem today as it probably once was, because we are living in the information age. At one point, everything you knew came from your parents, teachers and pastors. There really wasn't any way to get information other than through authoritative figures in your immediate circle. Today, however, information is available to us at the push of a button. Any questions you have about your religion have been discussed thousands of times on the internet with perspectives from all walks of life. Getting answers is easy. Perhaps asking questions might be the hard part? If you are indoctrinated early in life, what would cause you to want to go outside of your circle to seek answers? I mean, if you have a problem with your religion you should just ask your pastor, right? What made me (and many of us) lucky enough to see through the bullshit answers and go look for answers on our own?
Perhaps it is a form of child abuse, but as with all generalizations, some forms of religions are worse than others when it comes to affecting the way a child develops reason and logical thinking.