"Yet simply stated - what goes up must come down."
Not so fast, mclnnnn. This is not always true, you see. If it were, we couldn't launch missions into space. We have a spacecraft or two which have already exited our solar system. We threw them up and they aren't coming down. Gravity's an amazing thing, huh?
But they will eventually come down, right?
It seems that those most eager to postulate a designer would have trouble operating a can opener.