*waves team optimism flag*
For the current conversation: I'm not sure what I believe when it comes to religion, and I liked being able to transfer that over to Terrwyn.
I recently completed In Your Heart Shall Burn, and I'm trying to expand Terrwyn's personality and background more. So, when talking to Mother Giselle I chose "Fanatical belief is to blame", and Terrwyn said something along the lines of: "Belief in the next world is what lead us to this. We need to start believing in this world."
I really liked that. She's not sure what to believe, especially since her interest in her own pantheon is mainly academic; she just knows that beliefs her people uphold are filled with holes or missing, and the Chantry has warped the Chant to keep other races out and make mages appear to be monsters - now Cory wants to be a god, and it's tearing the world apart even more. So when all these belief systems have failed her line of thinking, she looks to rational, real solutions instead of prayer, or songs, or gods locked away or a god that no longer cares.
I guess that's why I headcanon that she hates blaspheming, but she slips up now and then because of where she was raised.