Your logic is extremely messed up. The parents did not kill their children, nor did they put the kids in this situation. The Barbaric and inhumane Koranimals are the guilty ones, and only them. The parents should not be accused of anything but having faith in their religion.
The parents were the responsible parties; 14- and 15-year-old children are not competent to make life-and-death decisions about their own well-being. The parents put themselves into mortal jeopardy, which is acceptable since they're adults, but they also put their minor children into mortal jeopardy, which is not acceptable. The outcome of the parents's flawed assessment of risk was horrendous. Religious risk-taking is not a game, nor is being tortured, raped and executed.
If your reading of Scripture encourages you to believe that taking foolish risks with the lives of your children is a good thing, I'm very saddened to hear it and can only hope that nothing awful happens as a result.
All the best to you and yours...