God created the world and the laws it abides by. It is infinitely more miraculous for us to experience God work inside the laws he's created on Earth rather than for Him to not abide by them. Outside of this world God can do anything and everything, as I'm sure many people have posted verses from the Bible stating such. In this world, He chooses not to do so, outside of Him coming to Earth in human form as Jesus and raising from the dead. There are many example of this. Read about the 10 plagues of Egypt. Then find, somewhere on the internet, a scientific explanation of these events. Christianity and science should not be viewed as rivals. God is the ultimate scientist and His greatness is shown in all things of this world. An amputee regaining a limb would, clearly, not abide by the rules he created so very long ago.