Is ‘the Gospel’ a New Testament Christian invention?

Hebrews 4:2For unto us was the Gospel preached, as well as unto them…” (All those whom Moses brought out of Egypt – the ancient Israelites Hebr. 3:16)

1 Peter 1:25 “But the Word of the Lord endureth for ever. And this is the Word which by the Gospel is preached unto you.”

Romans 3:2  “The Jews were entrusted with the very Words of God.” (Stern)

Acts 7:38  “It was he (Moses) who was entrusted with Words of Life, to pass on to us.”

John 4:22 Messiah declaring to the Samaritan woman: “You worship what you do not know; we (the Jews) worship what we do know, for Salvation comes from the Jews”

It should therefore be clear, that ‘the Gospel’ of the New Testament is not something new.  It is the same Message of Salvation and the Kingdom, and of  Eternal Life, which has been proclaimed throughout the centuries – first to Israel of old, then to Israel of Messiah’s time, and through to this day.  Throughout all this time, these Words or Oracles of God (the Gospel), which were entrusted to Israel (the Jews, Rom. 3:2),  contained a Divine Invitation which was extended to all humanity – all who would accept it.

Does the Gospel which is so popularly preached by the Churches in the world today, conform to the ancient Authentic Gospel?