Communication 2.2 - Supernatural expansion
Humans have an ability and tendency to take small packets of infromation and assume large background stories. Put in Atran's words,
A few fragmentary narrative descriptions or episodes suffice to mobilize an enormously rich network of implicit background beliefs.
When this is applied to the malleability of abstract beliefs, we have the potential to create our own Gods complete with fully fleshed out narratives.
All things being equal, some supernatural beliefs are better candidates than others for cultural transmission and retention in any given population of human minds because (1) they are more attention-arresting; (2) they have greater inferential potential (3) they cannot be processed completely; (4) they are more emotionally provocative.
Atran cites a number of examples that make this list easy to understand. Perhaps applying this list to the most famous Christian narrative of them all is reasonable. A 30 year old man doesn't seem to make an overly arresting as a deity. Certainly the Jews of Jesus' time didn't think so. His virgin birth has high inferential potential. His human nature certainly leads to the idea that he could be fully processed, however, his trinitarian claims oppose this. Emotional provocativeness seems to depend on his acts of charity, the cruel (although for the time, not unusual) death, and his low caste status. These are rather ordinary things that probably become significant because of their baseness.
From my perspective, the areas where God could be made more supernatural are the areas where things may have become leavened. Perhaps it is just my perspective, but it seems like these are also the areas that traditional Christians defend vehemently against corruption: virgin birth, mystery of the trinity, and significance of the cross. Has traditional Christianity unknowingly done its best to supernaturalize the possible down to earth nature of divinity?