Yeah, no sympathy for the High Sparrow from me either. At best, he was a fanatic thinking he was doing good but doing a lot of evil in the process, at worst, he as an hypocrite hungry for power.
Olenna owned him (well, Olenna owns everyone), taunting hm about how the gods were delivering their messages, by horse or by raven. In the episode Loras submits himself to the will of the gods, but it's a man, the High Sparrow, that talks on their behalf, how convenient.
Also, on the subject of religion in Westeros, some good advice from Davos: "If your god tells you to burn children, then your god is evil".