The object of the game is to make your civilization dominant. Religion in that game is a tool, much like military and economic power. It's one area where you must cover due to the nature of humanity.
Where as FFX's story actually... you know, has a story involving religion, power and life etc, though it takes a nearly Amish turn for a while. Albiet, it is in a fantasy realm, hence entirely fictional, but applicable. So, if what I said about religion is true in Civ, then Religion, though fictional, is given a wider and deeper story and examination in FFX.
See Ya George.
"He did not die - He passed Away"
At least following a comedians own jokes makes his death easier.