If the Supreme Being were just different manifestations to different groups then "better than" would have no meaning. If there were no competition among deities would the competition among cease human lessen? If we are all variations on the same melody how can one be better than the other? They are just different and the same simultaneously. Why would that be so bad?
Studies on the Inspired Scriptures and Their Background
Study Number 4—The Bible and Its Canon
The origin of the word “Bible”; determining which books rightfully belong in the Divine Library; rejection of the Apocrypha.