what causes mortal decay? the law we cannot uphold
So imagine someone could uphold the law? It must be impossible for any man to resist every temptation. Yet it has to be a man, because the law is made for men. So in God's grace he sent Jesus as a represantive of Him. Jesus sinlessness acctually entitled him to live forever just like Adam & Eve... yet he didn't, he dodged the bullet for us, took upon him all sin in the world and died for us.