Our creations maybe "unatural appearing" but our bodies are still more complex and efficient than a car. The incredible dna code uses information to manufacure all kinds of cells in our bodies. It's ordered and very purposeful. The function of our eyes are more complicated than the most advanced camera we have manufactured; something had to design it. We all have negative thoughts that make us doubt the designer of natural creation.
You are making an unfounded assumption that complexity is necessarily limited to creation by an intelligence. This is a common mistake when considering DNA because most abandon the consideration of the simple chemical reactions that affect cell type. Chemical reactions are ubiquitous in nature and need no direction to occur. During initial ontogeny, cell development is determined by the amount and type of chemical found in the area a cell is developing (mitosis). This chemical triggers the release of other chemicals which direct the production of other cell types. It appears that bodies are born of a number of chemical feedback systems where one chemical affects and relies on a number of others. Feedback systems are not restricted to creation by any intelligences and are found in many natural systems.
"It's ordered and very purposeful. The function of our eyes are more complicated than the most advanced camera we have manufactured; something had to design it.
This is simply argument by 'I don't think it could happen any other way'. As humans, any time we see something that seems to inexorably lead to a more 'complex' something we place a label on the process. This label is 'purpose', and because we use the term to describe our volitional actions we tend to assign intelligence to everything we label as purposeful. In the case of a biological process, the only 'purpose' is for the available chemicals to follow the chemical reactions that are dictated by chemical bonds, energy influx and the 2LoT. Purpose has become a shorthand way of anthropomorphizing that which does not have its own intelligence. This is done not because the situation warrants it but because of a desire to see something more than nature. We all have negative thoughts that make us doubt the designer of natural creation.
The designer of natural creation, according to design proponents, could very well be an alien race. Are you willing to worship this alien race as God?