"This thread has derailed to the discussions of Christian apologetics" because someone replied to a doubtful (not to say baseless) attempt to Biblical criticism (did you actually read the references and weighted them against the claims?) and answered a post so insightful and bright as to call the summit of the Divine Love for man "sacrifice of sadism"?!!!This thread has derailed to the discussions of Christian apologetics, and from this, we know that even Judaism has a murky origin.
Why only relatively "primitive" or "animistic" beliefs have animal gods?
What do you understand by "having animal gods", to depict/represent the gods in animal form or to worship animals as gods? The former might be (and often is) purely symbolic, the latter (including the worship of human animality) is specific to some of the most decayed kinds of beliefs and practices.