I've gotta admit, I like the Sumerians. I've just got this love affair with things long forgotten by most folks. The Sumerians, although maybe not the best, were the first, and one of the most forgotten. If I were to ask a random person what they thought of Sumeria, they'd probably ask me if that was one of those newfangled technology companies. They were ancient, they were powerful for a time, they hold numerous interesting secrets, and I like them.
But it is kinda true that its redundant to have both Sumeria and Babylon at once. And it is also true that, while Sumeria was the first, Israel was/is arguably more important in the overall scheme of things.
The real question to me, however, is not whether Israel is more important than Sumeria, it's whether they're so much more important that it's worth changing the game. I honestly feel as though the game needs to be tuned, not completely rehashed. (Although one must admit that the Warhammer mod is quite impressive!) Is it worth making a big change that almost doubles the download size and further differentiates this mod from standard Conquests to trade a nice civ for a slightly nicer civ? I just don't really feel that its worth it. Maybe its my fondness of Sumeria, maybe its that it'd be alot of change for a little increase in realism, and maybe its just me resisting change in general. I don't know which it is, but I just don't like the change.
If you do put it in there, though, I'll still like this mod, of course. It's a minor feature, anyways, and won't make much of a difference in the overall flow of the game.