A few thoughts :
Re: Hinduism. While Hinduism is polytheistic, some modern Hindus consider all those gods to be a manifestation of one true God. Others are atheistic and find them to be manifestations of man and therefore should be worshipped.
Anyhow, I have a qualm about Judaism being included, while it is one of the first monotheistic religions, and longest lasting (along with Zoroastrianism) it has only been practiced, officially, by three states - (ancient and modern) Israel, Ethiopia, and Axum. None of which have been included in any version I've played for CIV (II, III, Conquest). Moreover, while it's cultural influences are boundless, it's a rather small world religion. What sense would including it make? Other religions like Christianity, Buddhism, Hinduism, Islam, "Confucian thought" (it's not a religion) have been practiced in many regions of the world and have been "official" religions throughout the Old and New Worlds. What about religions older than the above-mentioned religions, i.e. polytheistic religions, animist ones? That would make a lot more sense, people practiced these religions before Monotheistic peoples converted them (with or without force). They still do! I think there should be a thread of verisimilitude or accuracy in games like this, it's what makes them fun, in my opinion anyway. This brings me to my first question - will certain Civs be predisposed to certain religions? Will Indians prefer Eastern religions and Islam (since the game includes Pakistani and Bangladeshi cities as part of "INDIA")? If so, what of a civilization like Rome or Greece which at one point abhorred Christianity and later embraced it and made it their own? See above the question regarding a "Muslim Washington" - which is funny considering Washington was a Deist, who believed God plays and inactive role in human's lives and though deserving respect really shouldn't be paid any mind (sorry Fundamentalists, but the original GW wouldn't have agreed with the religious views of current W, just as he wouldn't have agreed with Islam.)
Moreover, though I am not shocked, I am still disappointed by the presence of an American Civilization, since ours is at best 200 years old and really doesn't fit into many of the "what -if" situations which make games like Civ so fun (i.e. "What if the Romans survived long enough to fight the Aztecs?" seems like it would work more in this kind of forum than "What if America was founded in 5000 BC, guh-huk, even though they come from the English?") Will America be straddling European and Aboriginal/Amerindian culture again? Because, that's just silly. If we're gonna have Americans, have Native leaders like Tecumseh. I feel the inclusion of the United States of America (as opposed to a conglomerate of American tribes or something) makes the game non-sensical -- obviously just my opinion, but I'd like to share it. This leads me to another question, will cultures be "culturally" linked as in CIVIII, or just religiously? A combination of the two or more so would be more realistic, but who knows. Where would America, Greece, Rome, or India fit into this? (Since all of those civs have historically crossed the boundaries set up by CIV III Asian, European, Mediterranean, Amerindian, Muslim/Mesopotamian -e.g. though America is culturally European, it's still in the Americas.) I would like to see cultural links make other civs more willing to trade and share information, not just a smiling computer-generated face in the Diplomacy window.
Lastly, Mongols not being diplomatic? Who is the idiot behind that? Yes they were conquerors (like the Romans and the Vikings), but after founding the largest land empire known to man, they set up a state and had diplomatic relations with other states in the same way other expanisonist and bellicose civilizations did. Vikings, which never had a unified state unlike the Mongols, were equally bellicose and fierce and also had "diplomatic relations." C'mon, that's just false.
That's it. Not sure why I wasted my time typing this instead of my thesis.