Any Final Fantasy fans can answer these questions?

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Just finished Final Fantasy X but there are many things I didn't understand. Hope someone can answer these questions...mostly Sin related 1. Was the Zanarkand destroyed by Sin or Bevelle? Was Sin created after or before the destruction? 2. The Sin that destroyed the dream Zanarkand...it was obviously totally different flying monster that looked nothing like current Sin. We know that Tidus didn't really travel through time. Could it somehow be Tidus 's original memory? Was it the dealing of the Bahamut fayth kid? 3. After the Macalania Tample when they fall through the ice, there's a shot of Sin floating somewhere...were they actually on Sin's back? Because we know Sin has building and stuff on it's body. 4. If Jecht is a materialization of fayth's dream, how can he become fayth himself and materialize eons? Doesn't make sense