As pointed out, one of the self serving logics used by religion supporters is 'who created the earth, life and all these complex things that seems to be running so smoothly' and the answer is supposedly god but they do not want to hear the question who created god. Their logic seems to take a pause, rewind and delete at that question. They want to tag god as the unknown as it has been done in the past history many times such as when people used to believe that sun is a god and moon is a god. For the naive religion supporters, the unknown is their God. It's a good way to cop out of the unknown.