In any event, I think there were cross influences. — 3017amen
Absolutely. One current of thought would have it that the OT is purely Hebrew or Jewish but this has little to do with historical fact. We mustn't lose sight of the fact that the Hebrews were a small nation wedged between powerful and influential civilizations such as Egypt, Assyria, and Mesopotamia. The OT itself relates how the Hebrews dwelt in Egypt (Canaan itself was under Egyptian rule for several centuries) and how they were later deported to Mesopotamia. And, of course, there was Persian influence and as the OT says, there was the influence of other ethnic and cultural groups with which the Hebrews shared their territory, such as the Philistines.
The Philistines were apparently from the Aegean space (Crete?) but there were close commercial links between the Greek world and the Levant and, especially after Alexander's conquest of the region, there was substantial cultural influence that was officially promoted by the Greek rulers. There were ten Greek cities (Decapolis) in Syria-Palestine and Greek cultural and linguistic influence was particularly strong at the time Christianity emerged.
St Paul was born in Tarsus (Syria), an important center of Greek culture and philosophy alongside Antioch (Syria), Alexandria (Egypt) and other places. His teacher Gamaliel trained his students in both the Greek and Jewish tradition, and as the NT relates, Paul was sufficiently fluent in Greek and in Greek philosophy to debate with the philosophers of Athens where he also preached in the synagogue (Acts 17:16-34).
In addition to Greek being widely spoken throughout the Middle East including in Palestine, Hebrew and Aramaic had more than 3000 words of Greek origin, in addition to undergoing other changes in phonology, syntax, phraseology and semantics under Greek influence (G Scott Gleaves, Did Jesus Speak Greek? The Emerging Evidence of Greek Dominance in First-Century Palestine).
The NT was not only composed in Greek, but we find Greek concepts such as Hades used by Jesus himself:
“And I also say unto thee, that thou art Peter, and upon this rock I will build my church; and the gates of Hades shall not prevail against it" - Matthew 16:18
"And you, Capernaum, will you be lifted to the heavens? No, you will go down to Hades" - Matthew 11:23
But even going further back, we can see close parallels between Greek and Hebrew religion. For example, God (Zeus/Yahweh) was regarded as the king of the gods, was associated with a sacred mountain, and was represented as driving a chariot across the sky. Temple architecture shows alignment with the sun, animal sacrifices described in the OT could equally describe similar practices among the Greeks. Even the concept of afterlife as a shadowy existence in the underworld (except for heroes and the initiated) was virtually identical among Greeks and Hebrews, etc.
Edit. By the time of Jesus, Jewish religion had also come under the influence of Hellenistic religion which, like its Egyptian counterpart, believed in a divine judgement after death which would result in the soul either entering paradise or being condemned to a shadowy existence in the darker realms of the other world (see Phaedo, etc.). And this is found in Christianity, too.