Luke was most likely a Gentile - Colossians 4:10-14 (NWT)
- (Colossians 4:10-14) 10 Ar·is·tar′chus my fellow captive sends YOU his greetings, and so does Mark the cousin of Bar′na·bas, (concerning whom YOU received commands to welcome him if ever he comes to YOU,) 11 and Jesus who is called Justus, these being of those circumcised. Only these are my fellow workers for the kingdom of God, and these very ones have become a strengthening aid to me. 12 Ep′a·phras, who is from among YOU, a slave of Christ Jesus, sends YOU his greetings, always exerting himself in YOUR behalf in [his] prayers, that YOU may finally stand complete and with firm conviction in all the will of God. 13 I indeed bear him witness that he puts himself to great effort in behalf of YOU and of those at La·o·di·ce′a and of those at Hi·e·rap′o·lis. 14 Luke the beloved physician sends YOU his greetings, and so does De′mas.
If Luke was the writer of Luke, Acts, and Hebrews, that makes him the writer of roughly 27% of the NT.
Bobcat