Adam was made perfectly but with a design that required God to be honoured in his life and he would only keep living if that was so. Adam erred because he started as a life choice to live a life that put God second and removed God as total master. This meant he could still continue to live but not perpetually. God had not made a mistake in making Adam that way. It was Adam who made the mistake to start down a road as if life could be lived without keeping always to what God told him. It could but not perpetually. He had not been designed that way. So death became inevitable.
