Well, it looks like I'm actually devoting some brainpower to trying to make this work. Naturally, almost immediately I find myself having Deep Thoughts -- in this case about the four classes and what I plan to do with them.
The cleric is being, to put it kindly, a pain in the arse.
You see, the concept of a "cleric" or "priest" as it exists in the modern Western world (and in many other modern places for that matter) is of an individual who feels a higher calling, called to serve a higher power, preach the word, etc. etc, and this carries over into D&D with the benefits of getting nifty spells and the ability to smite (or control) the undead. Which is cool; I love me some crusaderish types with a warhammer or the pious healer types. It's all good.
But for the vast, vast majority of pharonic history in Egypt, it wasn't like that. Ye hells, there wasn't even an established priestly "social class" until the New Kingdom -- serving at a temple was something the middle class and the nobility did as a
job, as a duty. They had seasonal shift-work at the temples, even. And when the concept of an "official" priesthood developed in the New Kingdom it was still more of a job than what we often define as "priest": one could be granted a priesthood as a sinecure, much like any other title, and men could pass on their positions to their sons. Certainly a lowly
we'eb could work his way up the priestly ranks, but it was often more like looking for a promotion.
Priestly duties are also different from what the Western world is used to. The Egyptian priest maintains the rituals of the temple and performs the offerings to the god's statue in return for the benefices of the god in question to be given to the people -- a business transaction of sorts -- and because the rituals maintain the order of the universe so that the gods can do their thing. (The offerings to the deity were then distributed to the temple staff as part of their wages!) Very much an "I'll scratch your back, you scratch mine" sort of thing. This is why, when shrines and temples fell into disrepair such as during the Amarna interlude, the gods were said to not answer; humanity wasn't holding up its end of the bargain.
All of this isn't to say that there wasn't faith in Egypt -- there certainly was. In many ways, though, it was a very D&D-ish way of faith, with it's "I'll do x if you do y" (leaving aside how even the faithful will cheerfully threaten the gods when using magical incantations -- which the sun god gave to humanity as its perogative).
So, should there even be a "cleric class"? Or should it be subsumed into the other classes as something any given character may do as a profession? Much of the mechanical abilities assigned to the class fit just as well with an Egyptian "wizard" if not moreso. On the other hand, tweaking a few things to add a bit more flavour and keep the fourth class probably wouldn't break the metaphorical bank even if it might feel a little redundant to me as I write it.
Deep thoughts, blaergh ...