I think you are on the side of rational thinking, but, in case, like we have said 1000 times:The question of god healing amputees cuts out the ambiguity.
- If we debate about evildoers (George W. Bush comes to mind) - theists will say god sent the US military through George to stop evildoers.[rolls eyes]
- If we debate about funds for proselytizing, theists will say, as the money ran out, god sent the little old man that put a $50,000 check in the box (Oda Mae Brown comes to mind - "I know you don't think I'm giving this 4 million dollars to a bunch a nuns!")
...and so on with many conceivable possiblities of divine intervention.
So, since god can do anything anyway anytime, we surely can get proof of an amputee having an appendage grow back.
Before we must cover it again, things like the 1640 miracle of Calanda have been explained.http://skeptoid.com/episodes/4247
But I suppose we will eventually have a problem - through the long hours of scientific works, humanity experimenting with stem cells, etc. - no god in sight - science will probably get an appendage to 'grow back' , and once again, theism will say, well of course ...... goddidit.