> Egypt was pretty centralized from the beginning and their gods were not based on cities.

I don't think this is really accurate; you can often tell where an ancient Egyptian was from by the choice of god honored in his name. The gods very much are localized to particular places.

> "El" means mountain

"El" means "god"; this one couldn't be more clear-cut. If someone told you it means "mountain", you should dismiss anything else they might say.