Eh, i recommend replaying the game or maybe reading a transcript or something before creating an episode like this. The story was completely butchered.
Most important: in the actual story in the game, Yevon, the organized religion, and Yevon the god-like summoner have actually nothing much to do with one another. Sin was created by Yevon as a last effort super-weapon in a war between two cities (Zanarkand & Bevelle) that his side (Zanarkand) was losing. And Sin serves both as a weapon and as a way to keep the civilization intact, since the people that died for it live on in some sort of dream world inside.
The Yevon church on the other hand was created by the other side in the war (Bevelle), after they realized that they had technically won (their opponents all being dead) but they had left that unstoppable superweapon rampaging around. It is quite an important revelation in the story when the immense irony is revealed that the city of Bevelle, home of the Yevon church, was actually the side using technology in the war, and was forced to adopt the methods of their opponents (summoning) to survive even after they had won the war.
So the first 3 minutes of the video are pretty much dead wrong.
While the church of Yevon is displayed as very corrupt, that's not surprising, they're the all-round bad guy in the story. The overall tone however is much less one of anti-religion than of anti-war, or rather anti-human hubris, with the game telling multiple storylines where the theme is that human lust for power/wealth/advancement etc. is what leads to their downfall.
Next time when attempting to analyse a storyline, make sure you've actually paid attention when watching it first.