We need a little understanding here as to just who the Samaritans were. As you probably know there was the Northern Kingdom of Jacob, which contained the ten (10) Tribes, and there was the Southern Kingdom of Jacob, which contained the two (2) Tribes, for a total of the twelve (12) Tribes of Israel. Please take note, if you will, that the Southern Tribe is Judah, and the Northern Tribe ISRAEL, and is called Samaria, and each Kingdom had a King that reigned over them. How in the world do you deduce a Samaritan to be A GENTILE?
No Ituttut it is you who need a little understanding not only of the Samaritans but of the entire Bible.
If you will study the Old Testament a little you will find that most of the people of the Northern Kingdom were carried into captivity by Assyria never to return. These captives were replaced by non-israelites who intermarried with the Israelites. You should read the Book of Ezra to understand the animosity between the Samaritans and the Jews returning from captivity in Babylon. I remind you that devout Jews of that time would not travel through Samaria.
It is evident from a study of Scripture and history that the Samaritans must be considered Gentiles. They were considered by the Jews to be a mongrel peoples.
John Gill writes of the Samaritans, commenting on Verse 4:9 as follows:
"Ver. 9.
Then saith the woman of Samaria unto him, &c.] In a scoffing, jeering way,
how is it, that thou being a Jew; which she might know, by his language and his dress:
askest drink of me, which am a woman of Samaria? [not that the waters of Samaria were unlawful for a Jew to drink of; for as
``the land of the Cuthites (or Samaritans), was pure, or clean,
so, hytwqm, "their collections of water", and their
habitations, and their ways were clean ,''
and might be used; but because the Jews used no familiarity with the Samaritans, nor would they receive any courtesy or kindness from them, as follows:
for the Jews have no dealings with the Samaritans: some take these to be the words of the evangelist, commenting upon, and explaining the words of the woman; but they seem rather to be her own words, giving a reason why she returned such an answer; and which must be understood, not in the strictest sense, as if they had no dealings at all with them: indeed in some things they had no dealings with them, and at some certain times; hence that discourse of the Samaritans with a Jewish Rabbi .
``The Cuthites (or Samaritans) inquired of R. Abhu, your
fathers, Nyqptom wyh, "used to deal with us" (or minister
to us, or supply us with necessaries), wherefore do not ye
deal with us? (or take a supply from us

he replied unto
them, your fathers did not corrupt their works, you have
corrupted your works.''
They might not use their wine and vinegar, nor admit them to their tables; they say of a man ,
``because the Cuthites (or Samaritans) ate at his table, it
was the reason why his children went into captivity--and
further add, that whoever invites a Cuthite (or Samaritan)
into his house, and ministers to him, is the cause of
captivity to his children.''
And they forbid a man to enter into partnership with a Cuthite (or Samaritan ) and particularly,
``three days before the feasts of idolaters (for such they
reckoned the Samaritans, as well as others), it is
forbidden to have any commerce with them, to borrow of
them, or lend to them &c.''
But then at other times, and in other respects, they had dealings with them; they might go into their cities and buy food of them, as the disciples did, Joh 4:8; they might send their wheat to a Samaritan miller, to be ground ; and as it appears from the above citations, their houses and habitations were clean, and might be lodged in, with which compare Lu 9:52; the poor of the Samaritans were maintained with the poor of Israel ; wherefore the sense is, as Dr. Lightfoot observes, that the Jews refused to receive the least favour or kindness at the hand of a Samaritan; and therefore the woman might justly wonder, that Christ should ask so small a favour of her, as a little water.
The reason of this distance and aversion, was religion; and so the Ethiopic version, rather paraphrasing than translating, renders the words, "the Jews do not agree in religion, nor do they communicate with the Samaritans, nor mix together": and this was of long standing, and had been occasioned and increased by various incidents; for when the ten tribes revolted in Jeroboam's time, the calves were set up in Dan and Bethel, in order to draw off the people from worship at Jerusalem, which gave great umbrage to the tribes of Judah and Benjamin; and when the ten tribes were carried away captive by the king of Assyria, he planted the cities of Samaria with colonies in their room, consisting of Heathenish and idolatrous persons, brought from Babylon, and other places; to whom he sent a priest, to instruct them in the manner of the God of the land; but with these instructions, they still retained their idols, and their idolatrous practices; see 2Ki 17:24-41, which must render them odious to the Jews: and these were the principal adversaries of the Jews, after their return from captivity; and discouraged them, and weakened their hands, in the building of the second temple: but what latest, and most of all had fixed this aversion and enmity, was this; Manasseh, brother to Jaddua the high priest, having married Sanballat's daughter, governor of Samaria, was for it removed from the priesthood; who applying to his father-in-law, he proposed building for him a temple on Mount Gerizim, and making him an high priest; for which he obtained leave of Alexander the Great, and accordingly built one, and made his son-in-law high priest; which drew a great many profligate Jews over to him, who mixing with the Samaritans, set up a worship, religion, and priesthood, in distinction from the Jews; and this was ever after a matter of contention and quarrel between these people, and the reason why they would have no dealings with them.":wavey::wavey::wavey: