Guys, who from yougoslavians are Orthodox exapt Serbs?
Do Croats are Orthodox?

Only Serbs and ...so called Montenegrins each are ... Serbs.
Only Serbs are the real Orthodox Christians on ex-Yugoslavia. Proud and brave. No one else.

Many Albanians came from Albania to Kosovo in the 40's and again after June 1999. Certainly quite a few of them Orthodox Albanians.

Most Bulgarians called Macedonians by Tito are Orthodox as well.

Yes, but actually I was talking about basic people's religion ( I mean, that basic religion of Macedonia is catholicism, if I'm not mistaking).

And if in Yougoslavia - only Serbs, is there Orthodoxes in other Balkans, exrpt Serbians and Bulgarians?

These are Roman emperors called Illyricani due to being born in the province of Illyricum or by having Illyrian ancestry.
Maximianus "Herculius" - ruled AD 286-305
Constantine I - ruled AD 306-337
Maximinus Daia - ruled AD 308-313
Jovian - ruled AD 363-364
Valentinianus I - ruled AD 364-375
Valens - ruled AD 364-378
Gratian - ruled AD 375-383
Valentinianus II - ruled AD 375-392
Marcianus - ruled AD 450-457 (either Illyricum or Moesia,Thrace)
Anastasius I - ruled AD 491-518
Justin I - ruled AD 518-527 (either Thracian or Illyrian but born in Moesia,Thrace)
Justinian I - ruled AD 527-565
Flavius Valerius Aurelius Constantinus[2] (27 February ca. 272[1] – 22 May 337), commonly known as Constantine I, Constantine the Great (among Roman Catholics), or Saint Constantine (among Eastern Orthodox and Byzantine Catholic Christians), was Roman Emperor from 306, and the undisputed holder of that office from 324 to his death. Best known for being the first Christian Roman Emperor, Constantine reversed the persecutions of his predecessor, Diocletian, and issued (with his co-emperor Licinius) the Edict of Milan in 313, which proclaimed religious toleration throughout the empire.
The Byzantine liturgical calendar, observed by the Eastern Orthodox Church and Eastern Catholic Churches of Byzantine rite, lists both Constantine and his mother Helena as saints. Although he is not included in the Latin Church's list of saints, which does recognize several other Constantines as saints, he is revered under the title "The Great" for his contributions to Christianity.
Constantine also transformed the ancient Greek colony of Byzantium into a new imperial residence, Constantinople, which would remain the capital of the Byzantine Empire for over a thousand years.
Constantine I, Roman Emperor adopted Christianity following his victory in the Battle of Milvian Bridge 312. Under his rule, Christianity rose to become the dominant religion in the Roman Empire, and for his example of a "Christian monarch" Constantine is revered as a saint in the Eastern Orthodox Church. Not only the details of his adoption of Christianity make the religious beliefs of Constantine I interesting; Theologians and historians alike have argued about the question to which form of Christianity Constantine ultimately converted, with regard to the legitimation of religious persecution.
Though Emperor Constantine I had been exposed to Christianity by his mother, St. Helena, there is scholarly controversy as to whether he adopted his mother's Christianity in his youth, or whether he adopted it gradually over the course of his life.[1] Whatever the case, the accession of Constantine was a turning point for the Christian Church. In 313, Constantine issued the Edict of Milan, legalizing Christian worship, and the emperor would be a great patron of the Church and set a precedent for the position of the Christian Emperor within the Church that would be followed for centuries.

First, It would be more correctly to say, that Constantine was an adopter of Cristian belief in the whole ( as at that times, we know, the were not Catholicism - only Orthodox).
But actually, I'm not surprised that he was from ancient Albanian lands. Albanians overlived many historical events since that times: they were a part of different sattes, thaey were under Osmans and became muslims, and simply their historical belief wasn't too strong to refuse new religion ( as Bulgarian and Serbians did).

That was the most catastrophic event of Christianity, its becoming the official religion of the Empire of crucifixion.

Albanians accepted Greek nautical words. While they could be of Thracian origin, or could be connected with one of the numerous Illyric tribes and languages of the Balkan interior, they are not connected with the Illyric nation that preyed upon Roman sea commerrce from the present Albanian coast.