I agree. God created all 'in their whole substance' in the beginning. How many creatures are 100% carnivores? Many, like certain whales, birds of prey, spiders, etc., are designed internally to consume only living creatures. The alternative is to have them evolve from vegitarians to carnivores after Original Sin. We don't need that theology, do we?
On the other hand, the law of thermodynamics is probably a result of Original Sin.Saint Paul tells us ‘all creation groans and travails in pain until now.’ (Rom. 8:22)
Thus the sun and stars burn out and man made buildings decay over time.