I've never seen the bsn not take pot shots at each other. Superdrakone and the 4 posters below him already take potshots, the start of a cycle of traditional bsn bullying, ridicule, and mocking. As if anyone in the bsn has a right to judge when from where I'm standing, the bsn thrives on the making heated debates personal. Where does it start, when Ryzaki might have been narrow minded and dismissive, or when Andres called Ryzaki ignorant, blah blah blah. and then Raging Monkey says something flippant, I guess to ease the tension? Anyways it's hard not to take the issue of persecution of a minority race personal when it hits close to home, even if the scenario is fictional. It gets that way for mock UN meetings, and I'm not sure if it's "normal" not to take it personal because it's a fictional setting or to feel disconcerted that people get to develop persecution values in a fictional setting.
Anyways, to answer your question OP, just ally with the wardens, have briala rule through gaspard, and be antichantry in all dialogue choices and I think you might pull with Leliana as Divine. Also, goes without saying, don't support anyone else for divine in war table missions or dialogue. Personally, in my opinion, I think seekers of truth acting as Leliana's knights is the best ending. Templars need to be disbanded because it's an unhealthy occupation to be leashed to the Chantry via addiction and is just an new red templar army ready to fester. and mages will fall to red templars because they are templars on steroids so if the chantry needs a protection force, go with seekers of truth but according to the wiki you need to ally with the templars.