It should be easy to show evolution. If evolution is the grand mechanism that has produced all natural things from a simple gas, surely this mechanism must be easily seen. It should be possible to prove its existence in a matter of weeks or days, if not hours. A higher-order change, where the information contentof the organism has been increased should be showable and is not. Developing a new species changes the existing information, but does not add new information, such as would be needed for a new organ, for example.
People are intelligent.
All of our life's experiences lead us to know that such a robot could never come about by accident, or assemble itself by chance, even if all of the parts were available laying next to each other. And we are certain beyond doubt that a canister of hydrogen gas, not matter how long we left it there or what type of raw energy we might apply to it, would never result in such a robot being produced. And God made them, and he made us.