What difference does that make? It is
the gospel that was to be preached in all the world to every one, not just a gospel, or a different gospel, but
"the gospel". Also notice what Jesus said about those who do not believe "the gospel"= the gospel of Jesus Christ.
Mark 16:15-16
15 And he said unto them, Go ye into all the world, and preach
the gospel[/B] to every creature.
16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
Sounds pretty important to believe "the gospel" of Jesus Christ don't it?