When your child died as a result of a crime or tragedy, you can be very angry at God for allowing evil and misfortune in the world and for not being there to protect your child. Or if your child died of a serious illness, you can be very angry at God for striking down your child, for not answering your prayers and for the limits of medical science.
Why you may ask is evil in the world? Why were my prayers not answered? Why my child? Why is there no cure for that disease? Why God? Why? I can only tell you what I concluded long ago. Evil, corruption, disease and lack of knowledge are all part of the human condition here on earth. An earthly condition in which we are not guaranteed perfection during our existence. We live imperfect lives in an imperfect world. If you believe in the Bible, this can be traced back to the fall of Adam and Eve in the Garden of Eden.
So, what to do? You can go on being angry at God for what might be the sins and/or shortcomings of man. Perhaps this deserves some thought. Might you consider offering a prayer for enlightenment to somehow get over this great hump of anger. To see your way clear to some peace of mind. To some sort of forgiveness you can live with. If you feel you are able, I urge you to start here because anger is very debilitating physically and emotionally. Your prayer need not be anything fancy. Just a simple, "I'm here, God. Help me not be angry at You. Amen"
Man is composed of body, mind and spirit or soul all of which must be nourished. Without God or a Higher Power the soul/spirit cannot be nourished. I believe this lack of nourishment leads to anxiety and depression and a host of other problems as our society becomes increasingly secular and even atheistic.
Children and teens, in my opinion, are particularly vulnerable to this lack of of nourishment of the spirit. Without prayer and organized religion, children and teens seem to lack faith, hope, caring for one another and a strong conscience. I think this contributes to anxiety, depression, stress and a host of problems starting with bullying.
I believe evil can flourish where the spirit is not nourished with God or a Higher Power. If you blame God for what happened to your child, look at how much of society has rejected God. Look at the universe. May you find peace and strength and God again if you choose to do so. Amen.