Hey, as promised here are my choices. I hope this helps. Let me know if you have any questions or if you need me to clarify something.
My game play:
Divine: Vivienne
Romanced Cassandra
Had Templars join the Inquisition as Allies
Did not have free mages dialogue with Dorian
Did talk to Vivienne about the Circle and her experiences.
Did both of Vivienne's companion quests.
I don't remember the traitor at Haven quest, but Lelianna did kill that Chantry sister during her mission to Valence.
Told Cassandra there were other ways to help the Chantry.
Told the Chantry represenative that I needed both Lelianna and Cassandra
Had the cut scene with Mother Giselle talking to Cassandra about becoming the next Divine.
Vivienne thought Cassandra would make a good choice as Divine. Until I mentioned to Vivienne that she would be the perfect choice. It didn't seem like Vivienne had even considered being the Divine until I made the suggestion.
Encouarged all three about becoming the next Divine.
However, I only got the operations at the war table for Vivienne and did it. I'm not sure if this helps or not, but when I did the operation, my Inquisition's influence was over 10.
Sided with Celene at the Winter's Palace and had Gaspard spared and exiled.
Allowed the Wardens to stay and fight for the Inquisition. Though apperently they all died during one of my war table operations. Whoops.
My Inquisitor firmly believed he was the Herald of Andraste. And he would say it at every oppurtunity, also would mention his belief in the Maker whenever he could.
In terms of the Chantry dialogue, my Inquisitor mostly stayed neutral or positive about them. He never dismissed or belittled them. He didn't want to recieve the wrath of Cassandra.
When Cassandra brought up the possibility of her being Divine in dialogue, my inquisitor replied as long as they stayed together.
Cassandra ended up rebuilding the Seekers.
Let Morrigan drink from the well.
Also when I was in Val Royeux, I heard gossip of Vivienne being strongly considered as the next Divine. Not sure if that's a hint or just a coincidence, but I thought it was worth noting.