Bird wings work great. What's the point of creating a whole new structure for bat wings? AFAIK, there is no advantage to bat wings over bird wings. Give me one rational reason for doing so.
Of course, measuring efficiency would greatly depend on what the goal was, wouldn't it... Can you tell us what God was aiming for
No. And that supports the argument that bats and birds evolved, rather than being created. Give me one good reason why a designer would create two different structures to do the exact same thing.
Why not create bat wings. Bat wings work great too. Why didn't you go the other way with it. When you can make a bat out of nothing but elements, color it, size it, set it's environment and design something for it to eat all by speaking it into existance, I think at that point you'll be in a position to compare notes with God. Till then - until you have some basis on which to know His purpose in having done it the way he chose to do it, I think it is well beyond presumptuous to assume you could have done better. And not being in possession of all the facts or how everything works while HE does..