Alexander Fleming said, most mediocre scientists are athiests cx their calibre of science would not let them grow beyond that, when a scientists reaches a specific point, then he starts to understand that things simply cannot happen all the time cx of proability or big bangs. Things happen cx they are designed to happen in a specific way. Therefore, most scientists of high calibre are not athiests including Fleming and Einstien. What you are saying here is typical first stage of athiesm in which, mouth gets better of brain. There is a grand designer, does not matter what you call that entity, but human DNA is deisgned by someone, neurons are caliberated to work together by someone, it is highest level of engineering that human scientists are trying to mimic, it simply just does not work cx a bang was heard a long time ago :)