I also believe that Christianity is probably the best in-game religion, because it helps with keeping your cities under control and gives you access to the Hermitage with those morale-boosting religious units (the Priests) and to the superb Paladins when playing a campaign with Franks (my favourite barbarian faction).
Invincibility lies in defence, while the possibility of victory in the attack -Sun Tzu
Akouson me, pataxon de (hit me, but first listen to me)-Themistocles to Euribiadis prior to the battle of Salamis.