So, am I understanding you correctly that clerics in the party may choose any PH deity that they like, as far as domains, grated powers, etc. go, but all of these "deities" are just going to be different aspects/incarnations/ avatars of One All-Encompassing God, who will just be named "God"? So, as far as different granted powers and different domain spells are concerned, it'll be like different ways of worshiping the same God have led to different powers among His followers?
Cool. I like it!
And, btw, if you're not sure what to do with a Warlord, then I would really be up a creek, because I would, most likely, be totally lost with running one properly. And, incidentally, I have exactly ZERO experience at playing one.