Hi,
This quest is currently bugged for me. When I get to the 'KILL all Angels and cultists' stage in the quest after reaching the roof of the shack, I kill all the Angels and cultists but I don't get another step in the quest line. My Journal also shows that there is no next step to be completed in the quest.
Below is a link to a screenshot showing this:
https://prnt.sc/iyow21
Thanks
Sorry I posted the wrong screenshot, this is the correct one showing that there isn't another step in the quest: https://prnt.sc/iyoz0y