lol... I reckon, the poster just above yours is “projecting” his/her own stance towards Zoroastrians. Just look at his tagline.
I found that a problem, but one needs to realise the socio-political reasons: before 313 (when Christianity was no longer being outlawed in the Roman Empire), Christians actually had it better in the Parthian Empire rather than in the Roman Empire and they thrived and spread.
When Theodosius declared Christianity as the state religion of the Roman Empire, this became a problem -- if members of your empire follow the faith of the neighboring, enemy empire, that can be a problem.
The persecutions followed
however, when the Church of the East broke off contact with the Church based in the Roman Empire then the Parthian authorities went back to being benign...