Hi. Welcome! I’m not sure if we will ever fully know, so little survives of what they actually thought in the general public, only the state view in the temples have endured. Ma’at was pretty much everything and so long as the gods and mortals upheld that everyone was happen.
As far as the gods and goddesses merging. That is a long established fact, they came and went as popularity came and went, as well as emphasis or priority in certain areas, Pharaoh’s allegiances changed.
We have to remember that all this occurred over thousands of years, and even before the unification making what we know as the dynastic period, many of these deities existed in similar and/or different forms and names among the various tribes.
Personally I don’t think it matters so much if you work with one, more than one, or stick a load together as a single deity. Composite deities existed in various stages, though I think there were more common in the later periods; the Greeks were pretty enthusiastic about doing it.
For our own practices, and we as reconstructionists are in a privileged position where we can actually choose by preference rather than circumstances, choose how we feel we want to connect. My personal preference and its certainly not the only way, is to adhere as much as I can to Ma’at with the selection of deities I feel most suitable and just do my best. In the end its they will judge us and at times they do seem pretty inconsistent at times - much like us humans.
I had better stop now. Didn’t nottice I was writing an essay
Anyway ask away. Its good to ask.