The Faith militant seems to be very powerful after the episode of Cersei, where they made her do the walk of shame. Cersei did so in order to get to the red keep as she couldn’t handle the pressure anymore, so she made a deal with the high Sparrow. So in the coming season they might want to take control over the Throne as there is no one who looks reasonably strong to do so.
Download Game Of Thrones Season 6 Episode 3
We can see in the trailer that Lancel and the other sparrows approached Cersei as she wasn’t completely off their hook, were not expecting Ser Robert Strong aka the Mountain standing by her side. Lancel tells Cersie to instruct the mountain to step aside or else there will be violence. Cersei on the other hand responds by saying I choose violence, which means that she is very angry and can go to any extent in this season.