"Logical systems, languages, and "specified complexity" are only known to come from humans. Since we see these aspects within life systems, we can therefore conclude that humans designed life."
Interesting point. Lets see if I can take a stab at this. Supposing your theory is true (which we all know it is not), Humans created all of life.
There are a few fundimental problems with this. Firstly, if humans did create all of life, they would only be able to use the complexity available to them. Let me explain. The structure of the human anatomy is simple by comparison to the immense diversity on earth. Humans have the capability to breathe oxygen. So if humans created all of life, we would expect all organisms to breathe oxygen. This is not the case. The sun is the source of all energy for everything humans know. But there are organisms that live in immensely deep parts of the ocean that do not use the sun as a source of energy. This would surpass the knowledge of humans. Humans though complex, would have limitations, as is true with any organism. Since there are organisms that exist in climates that the human could not possibly know or understand, it's illogical to assume that humans created life.
If there is a creator (in my opinion there is), we should assume based on the diversity of organisms that he would understand each habitat and create the organisms to fit it perfectly.
Close?
Dennis.