Oh yeah jokes on all us Christians. God won't spontaneously generate limbs for amputees so he does not exist. yep, that proves it!
In all seriousness though, Jesus healed many people and it was demonstrated in front of literally thousands of people, as recorded in the bible and YET, only a small amount of people believed in him.
So, do you seriously think IF God did regenerate limbs for people today, that athiests would fall to their knees and become Christians? Yeah, I doubt it. What they will do is find a "scientific" explanation as to why the limbs regrew, that is what they will do. God will not get credit for it at all just like he does not get proper credit for your life, the air you breath, the universe you live in, the earth you live on, and all the extrodinary living things on this earth. Because you all choose to give credit to the fictional Mother nature.
Or, even worse, you say "Nothing created Everything".
Give me a break! Sorry GOD does not jump thru your little "test" hoops to prove his existance to you. Lilly