Is there a way to maintain public order in Attila ?

I’m currently on a legendary Western Roman campaign and actually have no problem with anything else except public order. I didn’t find it necessary to maintain public order at first since my garrisons would have no problem dealing with them but bc they won’t stop revolving, I’ve to fight 1-2 battles every turn and it turns the campaign into a slow and boring campaign.

For information about religion, I’ve already deleted every single church right after first few turns and built some Roman religious buildings across the empire (they cost food but give money so i chose them).