The general idea, at least in monotheism, is that God does not intervene on a minute by minute basis. Miracles are by definition exceptional circumstances that

The general idea, at least in monotheism, is that God does not intervene on a minute by minute basis. Miracles are by definition exceptional circumstances that rarely occur. I don't think the majority of believers would agree that God would intend mosquitos or cancer to simply be a torment specially created to bedevil man. A better question would be why would God create a world in which such things are possible? Like many things surrounding religion, it is simply unknowable. We can speculate all we want but it won't change anything. However, it's not very honest to take such a simplistic view of the matter. My original comment was intended to get you to think of things from another perspective instead of simply blaming God for all the ills of the world and demanding divine intervention as proof of His existence and love. It's probably better to ask yourself how can I make the world a better place rather than rage against God for not doing so. Perhaps that is the point.