I have some basic knowledge of Ancient Egyptian Culture, but I am looking for a book that dives deep into the REAL important history of our ancestors. I want to get a better understanding of our history of religion, the gods, the universe, spirituality, etc.
Have you checked out the AskHistorians reading list? There is a section on ancient Egypt that contains many of the best introductory books on ancient Egypt.
I provided some reading suggestions for Egyptian religion specifically in Beginner Guides to Learning about Ancient Egyptian Religion.