This is a fallacious argument, sorry. I will address the language first.
The Jewish population of Galilee was mainly composed of Judeans who migrated from further south (essentially the vicinity of Jerusalem) in the last previous few generations. The entire Jewish nation had lived under Hellenic powers for several hundred years, sometimes under enforced Helenizing policies. The upper classes were fluent in Greek, and most of the rest were exposed to it constantly for generations, even if they refused to use it.
The Romans resorted to Greek constantly in the East, because it was the language understood by common people on the street wherever they went.
There were also descendants of Greek colonists residing all over the region of Galilee.
It is very, very likely Jesus at least understood Greek, most of the Jews did, and Galilee had a greatly mixed population. A rudimentary knowledge of the language would be very useful to a woodworker plying his trade.
He seems pretty clesar Jesus read from the Septuagint, at least some of the time. It is believed He quoted from it.
Anyway, all the preceeding is not as important as the fact that Jesus called Simon Bar Jona Kephas, or Cephas. That is pretty obvious, which makes the question about whether Jesus spoke Greek moot point.
Michael
