This is a complicated question! Iām liable to write a book on itā¦
Petrie has something to say on this in his work on Ancient Egyptian Religion. I think it is particularly important to try and divorce oneself from modern notions. The word āgodā is steeped in a judeo-christian-graeco-roman legacy that makes it a completely nonsensical word to my mind, at least in its ordinary interpretation.
At the risk of sounding offensive: The one all powerful, pervasive and persistent god of monotheism makes so little sense on so many levels that it is hard to divorce that nonsense from the word. I am convinced that the typical modern antithetical, iconoclastic and uncivilised stance on polytheism stems from how poorly formed their notion of god is. I can picture my ancestors crying over thisā¦ 
Ra is not a āsun godā to my mind, he is never referred to this way that I have seen in hieroglyphs, he is the sun and personification of such, no more, no less. I am enjoying his warm and loving embrace todayā¦
We can talk about the netjer being in human form, and we can tell stories from that perspective, or reason about them in this way.
Khepri is often invoked like a verb or noun - and in fact I feel there is a good argument for the language lacking strict notions of noun, verb or personality that we use today. The wikipedia page on this is a bit confusingā¦ If you look in the Book of the Dead you will find several uses of the verb using the netjer determinative, in the many āspellsā (rā) of ātransformationā (xpr) into X
By far the most common occurrence I see of ānetjerā in writing is as the epithet ānetjer aaā, usually translated as āthe great godā, but it is also used to refer to the king, and is mentioned in the offering formula with reference to the deceased as receiving āall the pure (wab), beautiful things (nefer) from which the god (netjer) lives (ankhet)ā.
Personally my more direct experiences are complicated to explainā¦ I do not think there are some kind of magical entities with personalities that transcend space and time or the laws of nature, but I have certainly looked on the faces of the netjeru and known their power. Iāve long suffered from hallucinations including nightmares of what I now interpret as Nun. For me something essential about the nature of āgodsā is their impact, this is what makes them real for me - I donāt need to project anything onto them in terms of notions of personhood.
When I wake up and hallucinate a colossal jackal watching over my sleep and feel safe rather than terrified, and Iām left in awe, I know what that is. I do not fully understand where it comes from, people are incredibly complicated. Iām very prone to feeling religiously inspired when Iām in these states as wellā¦ and I absolutely believe that this is some part of the legacy of my ancestors.
Speaking of people and personalities, I think the more complex concepts of self and personhood from the Kemetic languages are extremely useful, and we can find references to e.g. Heka being one of the bau of Ptah. Its also worth noticing that individual people are constrained to having a single ba, unlike netjeru who are not so constrained.
EDIT: if i wanted to be scientific and precise about it, perhaps netjeru are some expression of our genetics, or some legacy thereofā¦ but to attempt to use the old language and go beyond that, some piece of the ākaā of people - what it means to be human.
āthe universeā or āall peopleā are certainly āone thingā in some way, and so i donāt think i need to invoke mysticism, or unnatural phenomena to justify some monism as part of the answerā¦ we all come from the same place, and ancestor worship seems to be fundamental across all peoples.
If i was going to pick on a day-to-day example, we all must listen, so we all are subject to experiences of āsedjemā as netjerā¦ and if we try to improve or change ourselves we will experience ākhepriā, also netjerā¦ āseshatā is perhaps one of the most powerful examples of this, one we have drilled into us at schools. these things have a life beyond the individualās experiences of them, they are a shared experienceā¦ interconnected and alike, without breaking the speed of light anywhere.
I wonder what Djehuty would think on this? Although I doubt Iād have time to hear it all ā¦ 
EDIT 2: for an extra science, Ra indeed will grow old and die, and it matters (!)