hi - well, surprisingly even after that.
Note that you can’t preach and no one can convert from Islam in Iran (or Saudia orQatar etc.)
But Christians who are born Christians can live and worship freely. I said “who are born Christians” - so the Armenian or Assyrian Church.
If a Catholic or Protestant were to preach there, there would be trouble (putting it mildly)
currently, there are at least 6000 churches and 380,000–1,500,000 Christians in Iran —> these Christians date from the first century AD - the Apostles Bartholomew and Thaddeus preached and won converts among the gentiles there.