Greek is a language. The New Testament was written in Greek.
Greek is a culture.
Greek is an ethnicity of the people from Greece.
The Bible sometimes uses the label “Greek” as a euphemism for everyone who is not Jewish, classifying people as either Jewish or Creek. In this context, the word Gentile is sometimes used instead of Greek.
Key verse about Greek: The Jews said to one another, “Where does this man intend to go that we cannot find him? Will he go where our people live scattered among the Greeks, and teach the Greeks? (John 7:35, NIV).
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 1,000-page website ABibleADay.com to encourage people to explore the Bible. His main blog and many books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.