[Abraham]

Your suggestion that not killing childeren is an exception to a Biblical rule is ridiculous. So is the idea that consequently there must be exceptions in the Quran as well. You can't compare apples and pears, dear Kissaki!
I don't think the New Testament promotes killing, let alone the killing of disobedient children.
Perhaps you refer to texts of the Torah (the Old Testament), the first 5 books of Mozes. Even that I doubt, because contrary to its neigbouring tribes the offering and slaughtering of children was strictly forbidden in Israel. Anyway I would like to see your source. If there is any, you should realise that such text would be more than 3.000 years old.
For (fundamental) Muslims the text of the Quran is holy and untouchable and does not allow for exceptions.
That's why Dutch cineast Theo van Gogh was slaughtered (tomorrow one year) ago for 'offending Allah' based on texts 'only' 1.400 years old.
That's why a substantial segment of Muslims in Holland holds the opinion that he asked for it himself by making the movie 'Submission'.