My main evidence comes from Acts but also from other sources. Just read the beginning of http://historical-jesus.info/hjes3x.html.And as I expected you really have no historical evidence for "Greek speaking proto-Christian Jews".
When Jesus started to be worshipped, it was as the heavenly Savior, as "promoted" after the crucifixion.There was no known Jew who was a Christian, fluent in Greek or not, worshiping a man as a God in the history of the Jews
Argument from silence. A positive argument, backed by evidence (if it can be found), would be Celsus did not know about Paul.Origen in "Against Celsus" did say that Celsus wrote nothing about Paul in his "True Discourse" against Christianity.
Just being silent about Paul (as in the surviving writings of Aristides and Justin) does not mean these authors did not know about Paul.
Earlier than Justin and Celsus, Papias wrote, quoting Paul in 1 Corinthians: it is said by the apostle, "For He must reign till He hath put all enemies under His feet. The last enemy that shall be destroyed is death." For in the times of the kingdom the just man who is on the earth shall forget to die. "But when He saith all things are put under Him, it is manifest that He is excepted which did put all things under Him. And when all things shall be subdued unto Him, then shall the Son also Himself be subject unto Him that put all things under Him, that God may be all in all."