There is a "God" setting on most computer games. It's not a "I am God" setting. It's basically an invulnerable mode which also gives you all of the supplies and/or ammo necessary to explore the game without having to worry about being stopped by adversaries.
It's popular with gamers who borrowed the game for a short time and they just want to explore the areas within the game or for gamers who get stuck at a level and can't finish.
just did a google search. apparently, "I am god" IS a cheat on the Age of empires PC game. Supposed to earn you "diplomatic tributes from other players", FWIW.
check it out here:
http://members.tripod.com/~MustangMan5/ageofempires-pccheat.html