Are there people in your world that just don’t get it, and keep spouting opinions that make no sense given the context of your world or would be disastrous if actually implemented? What are some of the most common bad takes in your world and what makes them so bad?
Initially not very powerful. The movement was most popular among the missionaries (naturally) as well as on the planet Hearthside. The tide turned when a dissolutionist preacher on Hearthside managed to convince half of the Bright Way’s private army (an order of warrior monks called the Knights of the Sun) to join the dissolutionists.
As for how the PD’s were treated by the wider clergy, a lot of them were sent to the Outer Belt to get them out of the way. The Outer Belt was the home of the missionaries (as it’s close to interstellar space) as well as former ecclesiastical slaves both manumitted and runaways, who formed the nucleus of the radical secularists that would become the Partisans.
I summarize things better here, here, and here.
I really like your technical style of worldbuilding. I’m fond of the little details that grand sweeping stories gloss over.