The main thing to take out of Diety is to stop wonder whoring and devote your early turn to building settlers. The sooner you get your core cities out and hopefully a National College soon after the quicker your game will end.
I think this is where I went wrong in my current game. I'm Pacal, standard speed, large map, 1 less civ, 1 more CS. Found myself on a pretty big continent with 3 CS and Indonesia. Beelined to Theology, used the GS to found an academy, but didn't found my second city until after the NC. In the meantime, got a religion (did get Desert Folklore, and tithe - most of the other good ones got snagged by the first 2 civs to pop a religion).
So this is me at turn 80 with my own decent religion, about to get a GS, and the NC done. Feeling pretty good about myself.
http://steamcommunity.com/sharedfiles/filedetails/?id=681417633
But, knowing what I know now - Indonesia with 7 cities is gonna be a pain, and Palanque is too small.
So, here's turn 106:
http://steamcommunity.com/sharedfiles/filedetails/?id=681417685
I simply took way too long to spread out. When I forward settled Tikal to hog the great Eastern Desert for myself, it got real.
Because he has more troops and money, he won't make peace.
So, this is me 60 turns later having gotten very little progress growing because I'm fighting to shred his muskets in the forests and marshes east of Tikal (luckily, since so many of the good belief were gone, I took holy warriors and used it to spam out crossbows every several turns - really shifted the fight my way).
http://steamcommunity.com/sharedfiles/filedetails/?id=681420110
I think in another 20 turns, I can take Surabya (I'm gonna use one of my GGs to plant a citadel right next to it, and buy some catapults to upgrade to Trebuchets before my holy warriors expires) - I need to do it before he takes out Hong Kong (my CS ally in the south - found a use for that damn GM the Maya made me pop - allied them at a critical point in the war).
It's been fun, and I'll win this fight, but I'm pretty sure that I'm going to wake up to find every other civ is light years ahead of me - I started this war at #3 in tech - now I'm #6.