Why, is simple. When you teach a child to believe in Jesus Christ, you teach them to believe in a God, who never really said, or had anything written in the Bible for anyone who didn't sin. Basically, when you teach a child right from wrong, and they learn what it means to sin during a sermon, eventually they learn that they are not accountable for a sin until they knew it was one.
http://www.biblegateway.com/passage/?book_id=50&chapter=9&verse=40&end_verse=42&version=31&context=context
So, if you, like myself when I was in the fifth grade, get on your school bus and ask the rest of the kids about your age, one simple question, "If you have never sinned, how can you be saved?" and just do not allow anyone to dissassemble the question insomuch as to reject statements such as, "Everyone sins, sooner or later." Which, is a trained and taught answer and by no means reveals how the Bible Teaching of Believing in Jesus Christ, makes a kid feel and think.
Therefore, sybiling rivalry, and the noted rebellious teens noted by so many Christian Parents as normal behavior for those agegroups, is literally brought on and taught by teaching the kids to believe in Jesus Christ, as if eternal life were dependant on him. Very simply, Jesus Christ, died for the sinner, and the word sinner defined properly really means, repeat offender and is bent more firmly towards habitual offender, is the sum of the whole to whom the gospel is written, and Jesus Christ, is speaking too.
My verdict therefore is that Jesus Christ, is evil, and it is because, a child cannot help but think that they actually need to sin to be saved. Oh, and I do know that it is wrong to teach a child to think that way.