The governor is enforcing Roman law and Roman rule. Look what they did in Gaul and Britain. The Romans allowed pagans to maintain some of their own culture, but Roman law, Roman trade practices, and Roman religion were enforced. Of these the most relaxed were the religious practices, provided the locals recognised the superiority of the Roman gods (which is a bit rich since all they did was change the name of the greek gods) they could keep their own practices, with one or two notable exceptions.