Now you are just making stuff up. Have you actually seen their dialogue? The two got along well in the base game. Cass openly says that she's glad you recruited Vivienne at Skyhold. Also, practically all their dialogue is the two of them having mutual respect for each other. Read for yourself:http://dragonage.wik...aghast/Dialogue
Maybe it's just me, but a religious leader should be devout and humble, not some stuck up noble who just pays lip service to the religion.
Also, how is Leliana the worst?
I guess my memory is getting faulty on in game stuff, it's been a while since I played last.
Humility is good, but wisdom and confidence in such an important leadership role that involves religion and state politics is just as, if not more, important. Viv can play at both, too. Whichever will get the job done, as Justinia would agree, since she did use her Left Hand for less than ideal missions.
I thought Viv was quite honest in her Andrastianism; I know of no evidence to the contrary. Also, Viv isn't a noble, she was the child of merchants who was given no advantage in the Circle, unlike some other mages who had family support, and went from bottom to top by her own strengths. She's also a very caring person, even if she seems like a ****** to some.
As for Lel, it's just my opinion since she came off as a radical that would cause more issues than Viv would, which I don't think the Chantry needs at that time. While a mage Divine is radical, it's not against doctrine (apparently), and Viv would be able to play it off. Also, a mage Divine who isn't a radical in other ways would do wonders for how mages are perceived, still dangerous but can be as faithful to the Chantry as anyone.
To tie it back on topic: It's not like who is Divine matters too much, since the epilogue to Trespasser sets Thedas up to generally be the same in all world states with the only differences being the details on how they became the same.