Not necessarily. If you read the book of Matthew Jesus actually went to a town where there was Gentiles/non-Jews and preached first. It was both Jews and Gentile and He preached to both. And Matthew 4:15 "The land of Zabulon and the land of Nephthalim, by the way of the sea, beyond the Jordan, Galilee of the Gentiles. " the word Gentile is nations meaning it was a mixed multitude. There were Jews there, but the majority were non-Jews.