If I were God, you wouldn't need to ask me (pray) to heal your child's cancer. I'd just fucking do it. If you believe that God "intervenes", that He performs miracles, or that He has a grand plan, then you are utterly thoughtless. Look around you. The complete randomness of the world suggests that there is absolutely no scheme going on behind the scenes. If there is, however, then God is one scary motherfucker, deserving only fear - not praise.