Thanks for the accolades, fellow Texan, but I'm not really the supreme leader here. That honor belongs to Robin Patterson, the wiki's founder.
In the first paragraph of my earlier post, "lost" refers to a war, not an individual city. The number of cities captured/razed could certainly be used to help determine who "lost" a war, but if that were the only metric used, it would leave a lot of questions unanswered.
Byeikk, see the second paragraph of my previous post. The AI leaders' defeat cutscenes don't play when a human captures their last city and wins the game, so how much sense would it make to have a cutscene that only played when they completely wiped out a human player?
I think the biggest challenge would be adding code to check for whether the AI or human player lost the war, let alone defining "lost." Would it be determined by who captured the most cities? Killed the most and/or lost the fewest units? Inflicted the most HP in damage? Plundered the most trade routes? Pillaged the most tiles? If all of these things entered into the equation, what would the relative value of each one be? And if AI leaders had unique messages when they won a war, wouldn't we also expect them to have unique messages when they lost a war? Having both would increase the number of voice clips for each leader from 7 to 9 (including the ones in the Civilopedia entries), which would mean larger game files and more time spent recording and incorporating the clips into the game.
On the other hand, if the OP was asking why there are no special cutscenes when an AI player captures a human player's last city, AlternativeHuman93's explanation is accurate. Why bother recording a voice clip that's only going to play right before the defeat movie in very specific circumstances?
Religion, while useful, isn't a winning condition in Civ5. Try to focus primarily on science, and spread your religion as circumstances and your faith stores allow.
If you're focusing on population (a tall empire vs. a wide one) as I recommend above, choose Tithe as your religion's founder belief - the extra gold will help your economy stay solvent in the midgame and beyond.
Train a Scout and at least one Atlatlist while researching Pottery. The Pyramid is one of the best unique buildings in the game, and building it in your cities will allow you to found a pantheon and a religion early on while also giving you a boost to science. Messenger of the Gods is probably the best pantheon to choose, since the Maya can develop science and religion concurrently.
Rush Theology so you can activate The Long Count as quickly as possible, using Warriors and Atlatlists to defend yourself. (You should have at least three cities by the time you finish researching Theology.) Upgrade your Atlatlists to Archers once you research Archery and have some extra cash, then keep growing the population of your cities while developing them for science and faith and trying to keep your empire's economy strong. The Maya can easily play a defensive game while working toward a science victory, but if you need to eliminate a militaristic or aggressively expansionist neighbor, you can get a free Great General from The Long Count and then wage war to wipe out the threat.
When choosing social policies, fill out the Tradition tree first and Piety second. Rationalism is a must once you reach the Renaissance Era. Try to build the Hanging Gardens (for the extra food) and the Porcelain Tower (for the free Great Scientist and extra Great Scientist points) as they become available, and remember that you can effectively build a free wonder with the Great Engineer from The Long Count. Save as much faith as you can to buy Great People in the Industrial Era and beyond - depending on which ideology you adopt, Great Scientists and/or Great Engineers will be extremely useful.
Hope this helps. Have fun with the Maya - they're one of my favorite civs in Civ5 and its expansions! :)
I can get behind that.
Works for me, but that probably goes without saying. ;)
Queen Tomyris is the Scythian leader.