of course the muslims are allowed to broadcast on radio. Of course this is special treatment just for some christians. The article mentioned the armenian orthodox church which is christian. I'm sure this rule won't apply to them either. But you see armenian orthodox church will behave differently. They won't read from bible on the radio. They won't evangelize as these protestants do. It is the style of christianity that is so strongly disliked in many countries.
In greece they've outlawed the methodist church. In many european countries they've outlawed some individual christian denominations. If you talk to others about christianity, then you are on very shaky ground in many countries.
In China/Vietnam they don't allow bibles, you get caught with one and you go to jail. In Russia some christian groups are outlawed.
A few years ago in Indonesia they had large disturbances where many christians were systematically killed, homes burned, etc. right in jakarta the capital. Authorities allowed it to happen. Many christians have been killed in many countries also just in the last few years. They're killed for being christian.
Your claim is patently False!!! Father George (Methodist) has even started a Kosovo outreach program from Thessaloniki in Greece.
As for your comments about the Armenian Christians - nothing could be further from the truth! 99.9% of Armenians either died in the genocide committed by Turks or have left many years ago.
Finally, the reason that some Eastern Orthodox Christian countries are resistant to proselytizing by other Christian denominations (Roman Catholics for example) is that it is simply not needed. Why would one Christian group want to evangelize another Christian group? Why not evangelize the unchurched instead?