You want to know the real answer to the question posed on this forum and website, "Why Won't God Heal Amputees?" It is this.
As you have noticed, God doesn't "heal" amputees (i.e. grow a new arm back in the way that you can heal many other diseases.) First of all, God would not heal on our command; He would heal for His own purposes. Could God do that? Could He grow a new limb back? Of course! If He created the Universe, He could do that and anything else He wants. But you have put your definitions and assumptions on what God should and should not do. You have it all bass-ackwards. Thus, you will continue on in finding no answers to your question. God doesn't "heal" amputees because it wouldn't require any faith on the part of people such as yourself. Does God heal amputees' hearts, those who call upon His name, and do invisible things inside their inner persons? Of course He does. Scour the Internet for those stories and testimonies instead of stories that only support your limited way of thinking. Does God work in their lives in a multitude of ways that will still leave you confused and confounded? Obviously.
You should be more concerned with the question, "Why Won't God Heal the Heart of a Spiritually Dead, Prideful Person Who Seeks to Disprove His Existence?" The answer to that question might lead you to seek His healing for the sickness in your heart, the sickness of spending your life on a website such as this, looking to poke holes in any argument that does not fit in line with your twisted world view instead of honestly searching for God to reveal truth to you. The question, "Why Won't God Heal Amputees," is a faulty one, and it does not seek and honest answer; it only seeks to bolster your own pride and delusions.
Change your question. Until you do, you'll never find true answers. God is a healing God insomuch as He heals hearts and brings Life to the ultimate problem of death.
"Why Won't God Heal Spiritually Dead, Prideful People?" Because they don't want to be healed. They love their sin.
"For God did not send his Son into the world to condemn the world, but to save the world through him. Whoever believes in him is not condemned, but whoever does not believe stands condemned already because he has not believed in the name of God's one and only Son. This is the verdict: Light has come into the world, but men loved darkness instead of light because their deeds were evil. Everyone who does evil hates the light, and will not come into the light for fear that his deeds will be exposed. But whoever lives by the truth comes into the light, so that it may be seen plainly that what he has done has been done through God."