In what language were the four Gospels and Paul's writings originally written?

I'm an Orthodox Christian and the tradition we believe says that Matthew and John (the Gospel writers) are the same as Matthew and John (two of the original 12 apostles). I know that scholars say that the Gospels were written at least 70-80 years after the Crucifixion, but I believe in the tradition. Also, the same scholars say that the Gospels were originally written in Greek; however, I couldn't find an answer for each scripture in particular. If we start from the premise that Matthew is the tax collector that Jesus saved and made an apostle and John is one of the other 12 apostles, that means that Matthew's Gospel was originally written in Aramaic (if we assume that the language spoken in the kingdom of Judah at that time was Aramaic, not Hebrew) or Old Hebrew (if the Aramaic thing is not true). Mark and Luke's Gospels, according to our tradition: Mark was Saint Peter's disciple and was from Levi's tribe, so he must have written originally in Old Hebrew. Tradition says that Luke was from Syria and knew Greek and Egyptian so he must have written his Gospel in Greek. Now, Paul's Epistles must have been written in many languages. He wrote the Epistle to Romans so that scripture must have been written in Latin if it was for the Romans, plus Paul was a Roman citizen so he probably knew Latin. He has a lot of Epistles to Greek cities (Corinth, Thessalonica, etc.) which must have been written in Greek. Also, he has a letter to Jews so he probably wrote this in Hebrew. **Question summary**: In what language was each book of the New Testament originally written according to The Holy Christian Tradition, not according to atheist scholars?