Bruce Wayne said:What is wrong with God being egocentric? It needs not be an offence. After all, it is He that holds this reality together. Everything is Centered around his power and his sustainance.
Because ego is contrary to the concept of the ultimate enlightened all powerful being. What do you think when you meet an egotistical person? Now multiply it by 100 and you have christianity's, judaism's and islam's egomaniacal god.