Bad Ending- Break into the Chantry and then admit with no remorse that you did so to the Divine
Meh Ending-End the encounter with the Divine with less than 5 favor
Good Ending- End the encounter with the Divine with more than 5 favor
There might be additional ending variations based on how much favor you get. For example, you might have three versions of the meh ending based on whether you recover the chantry keys (2 or 3 favor) and whether you recover Serault's ancestral mask (5 favor). Additionally there might be two good ending variants based on whether you get 10 favor or not. So best possible results are to hit 10 favor (takes 30 items, although you can in theory pull it off with 21 I think). There could be additional ending variants, but if so I dunno what they could be.