One Question That Needs Clearing Up...

[Masamune·1600]

Interesting quote from them. I had missed that one. Does this mean Sin is an integral part of Dream Zanarkand's summoning ? Was Dream Zanarkand the reason for Sin ?

In a sense. Sin really is an armor; it ostensibly would prevent anything from interrupting Yu Yevon while Summoning the Dreams of the Fayth.

We agree 100% on this except for the origin of the idea. You say

Except this is not what Maechen says.
"Yet the people of Bevelle still feared Yu Yevon."
"It was to quell his wrath that they revered him, and first spread his teachings."
"And so were born the temples of Yevon."

So you are saying that Bevelle came with the idea of glorifying Yu Yevon all on it's own ? That is not what I read in the quote.

When I read It was to quell his wrath that they revered him I read that he was wrathful at one time and that he himself (or at least someone claiming to speak for him - Yunalesca) demanded that people from Bevelle revered him

Sin destroyed the original Zanarkand before Bevelle arrived at the city. Since Sin predates contact with Bevelle, we know that Yu Yevon had "become" Sin before he could have spoken with Bevelle. And, once he became Sin, Yu Yevon lost the ability to communicate with anything, really.

Interesting. Yes, that would prevent Bevelle and Yu Yevon from talking after Sin appeared.
But wasn't Yuna's Zanarkand destroyed by Bevelle's bombing ? Where did you get it that it was Sin who destroyed all ?

Another explanation by Maechen involves the destruction of Zanarkand; in the passage, Maechen shows that Bevelle arrived at Zanarkand after Sin appeared, and later discovered the city already destroyed.

Maechen:
"There is a legend, you know."
"Just before the horrible Sin appeared..."
"a terrible war raged between Bevelle and Zanarkand."
"When the armies of Bevelle attacked Mount Gagazet, they heard a song echoing across the snowy slopes."
""'Tis a song from an otherworld," they said. The soldiers panicked and ran."
"And then, as if to pursue the retreating armies, Sin appeared!"
"Some time later, scouts from Bevelle braved the mountain."
"On the other side, they witnessed the ruins that had been Zanarkand."
"The city destroyed. Not a single soul left standing. Gone!"
"In its place, a multitude of the fayth had gathered on Gagazet."
"They were singing a song."
"It's the song we now call the "Hymn of the Fayth.""
"And that, as they say, is that."
"Well...maybe not all of it."

This extends naturally into Maechen's remarks on the original Final Summoning. Following the above chain of events, "rumors flew in Bevelle [concerning the appearance of Sin]." As it became known that Sin was Yu Yevon, they (Bevelle) understandably reacted with fear.

Also of note, regarding Maechen's remarks, is that the Hymn of the Fayth was first heard as Bevelle advanced on Gagazet. As the Fayth are later discovered singing this hymn, we know that the Fayth (and therefore the Dreaming) also began prior to Bevelle reaching the ruins of Zanarkand (once again consistent with the established continuity of FFX).