...what the fuck?
are you crazy? Going back to Civ 3?
I rather play Civ 4 with Fall from Heaven mod
http://kael.civfanatics.net/index.shtml
going the fantasy route allows you to actually have fun with unique civs and their abilities. Orcs have double military production for fast zerging, Vampires can consume town population to get more powerful.
And since the religions are fictional, they can throw away the bullshit 'every religion is the same' and put demon worshipping bastards that open the gates of hell to summon Satan Civilization upon the world or Order that summon Angelic Civilization on Earth to rid yourself of Evil Civilization. And don't think your alignment is set, when adopting different religion and civics, your alignment will change and open up better diplomacy with other kingdoms.
Taking Slavery and Conquest will please the barbarian nations, plus successful attacks will have a chance to garner you slaves to work or sacrifice to produce buildings faster, but don't expect the goody two shoes neighbour to tolerate this sort of behavior for long. Prepare alliances and beat them to submission, convert them as your vassal as you increase the armageddon count and bring Hell Upon Earth with flame engulfing forests and fields. Rivers will turn red into lava and Horses will make way for Nightmares. Civilization will never be the same again.