Go full Traditional then straight into Rationalism (if you have to waste a point somewhere else because you acquired policies too quickly so be it) and aim for a Space/Domination victory. ICSing is complete trash in BnW since each city that you found increases tech costs by 5% and it usually incites wars from your nearest neighbors due to aggressive expansion. This makes opening Piety and ICSing fairly terrible. Shrines don't even take take a long time to build, especially if you settle on a hill. The rest of the tree is pretty terrible and the bonuses just aren't worth it. Going with a 4 city tall build is just so much better because you can use religion to boost your growth and since population= science and science= everything it just makes much more sense to focus on it. It's really hard to have a decent beaker count when you ICS because dealing with happiness is Hell, growing your cities is hard and even when the stars align you still have to find a way to overcome the 5% increase in costs. Also, finding ways to generate gold is really hard because small cities cost you a lot and produce very little themselves. There's so many disadvantages to the strategy and for what? So you can claim more land and potentially a few more strategic resources? It's so pathetic how lopsided the trade-offs are.
Note: I'm ignoring the cheesy Sacred Sites strategy for the time being. I'm just assuming that it's going to get patched out eventually. Obviously that tactic is overpowered as heck and Mayans are one of the better civs to abuse it with. The gist of the strat involves opening Piety and rushing the "final policy" to get Sacred Sites as your Reformation Belief. From there you use your Faith to purchase as many Faith Buildings as you can in as many cities as you can. You can basically just mass expand into 1 pop cities if needed. You'll win the game despite having no gold, no happiness, no units, no tech, etc. Your Cap can basically do nothing but churn out Settlers and workers because you don't really need anything to make this strategy work.
Alternatively you can open Tradition then go into Liberty straight to Collective Rule so that you can churn out 2 Settlers (3 total if you include your free one) and then go back to Tradition + Rationalism. Don't worry about finishing Liberty off. This tactic works well mostly because the AI never builds the Oracle (even at Deity) so you can usually snatch it up before or after your NC. As long as you get Amphitheaters and hopefully Sistine Chapel (another wonder that AIs usually ignore) you can still power through most of the trees. It's slower, that much is clear, but being able to churn out Settlers quickly is awesome. The faster that you get your cities the faster that you can acquire and sell luxuries and that early GPT is essential if you want to buy Universities, Public Schools and Research Labs and such in your cities as they become available.
Maya is secretly (not secretly) one of if not the best science civs in the game. Yes, that's true even though Korean and Babylon are civs. Mayans get a non-trivial early boost to science and their UB ensures a religion at which point you can get growth modifiers (+10% growth, +15% growth if not at war, +1 food from Shrines and Temples, etc). Once you pair those bonuses with your bonuses from Tradition you can grow 4ish big cities extremely quickly. In addition, the Mayan UA no longer hinders your ability to produce GSes ever since they changed the way that the GP pool works (at least to my knowledge it doesn't). What this means is that you can still churn out GSes at a reasonable rate while taking full advantage of your freebies. Your UB is just there to ensure your religion and to provide you with a decent tech boost in the early stages of the game (where it arguably matters the most). Don't look at it as a "well now I need to mass expand" enabler.
That's how myself and many other people use Maya to dominate Deity and multiplayer games. The sad reality is that there's just no good reason to ICS when you can peacefully grow 4 cities extremely high extremely fast and out-tech anything. You will never get out-raced to space victory as Mayans if you play them properly, even against Deity computers. You might lose to diplo, you might lose to war but you will just never lose if you use religion to grow tall and peaceful with 4 cities.
