A good god could, if it wanted to, have designed all life so that it is directly sustained by manna from heaven, with no need for consumption of biological matter. But almost every form of life must by its very nature capture, kill and eat other living beings in order to survive. Without this murderous torment, life is impossible. If not by direct consumption, then, organisms must still acquire biological matter at the expense of others: the competition for food is also a case of living beings being required to outdo each other merely to survive. There is no way to live life along a principal of do no harm.
If life was created, and not simply the result of undirected unconscious evolution, this is surely the worst possible way to have created life. A god could not have created a more vicious cycle if it tried: tying the very existence of life with the necessary killing of other life is the work of an evil genius, not of an all-powerful and all-loving god. Either no god ever instigated life or guided it, or, such a god is monstrously evil.
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