But enwibee, I'd like you to consider the following:
We are considering the human body and it's immense complexity, Abraham argues that due to the complexity the of the human body, he believes that there is a creator as it is too complex to have arisen by chance. I understand that in your mind you have disproved this by challenging his logic, but you have not qualified your own logic for there certainly being no designer. Thus, I will now challenge your logic. How is it that you see something and make the conclusion that there is no designer?
So in the end, it really does just come down to what you believe, not what you can qualify, because you just cannot and this is not a decision like 'Is there toast in the fridge?' and not necessarily one bound in logic. Life, is often not bound in logic, it's not necessary that the answer to this question is either, so sometimes you just believe what you do, and that's it.