Romans were tolerant of other religions as long as their followers were respectful of the Roman religion
The answer is: Romans were tolerant of other religions as long as their followers were respectful of the Roman religion
At that time, the involvement of the catholic church within the Roman empire was indeed really strong.
Even though many of the Romans may mocked other people who did not follow their religion, The people who held different religion would not face any legal problems as long as they don't openly mocked the Roman religions.