https://www.youtube.com/watch?v=wtDmtVgOU6I&list=UUIt3_DBxx1D1Bn3gsnIDptg&index=2 Modded World: http://www.xpgamesaves.com/files/file/3239-minecraftworld-tml-2-god/ Tutorial (I don't know if it's patched): http://www.xpgamesaves.com/topic/50919-tut-how-to-mod-minecraft-godmode/#.US4K_KLomSI
The tutorial isn't patched, I still use it. If the world is for people to have God Mode on, it doesn't work like that, it's only you who would have the God Mode.