I am not sure most theists themselves actually know how their mythology has evolved. I suppose thinking of their holy books as a collection of analogies gives them a get-out clause and the ones who take it literally probably just don't believe the historical evidence.
Regardless it must be somewhat uncomfortable to hear that your entire life is based upon an idea that has gradually taken shape from other religions which you don't follow. Aren't gods supposed to be timeless?
Regardless it must be somewhat uncomfortable to hear that your entire life is based upon an idea that has gradually taken shape from other religions which you don't follow. Aren't gods supposed to be timeless?