EnterTheBowser:
No, Ruth was not an ethnic Jew.
Was Abram/ Abraham “an ethnic Jew”?
//////////////////////////////////////////////////////////////////////////////////////////
Genesis 11 (New King James Version)
biblegateway.com/passage/?search=Genesis%2011;&version=50;
27 This is the genealogy of Terah: Terah begot Abram, Nahor, and Haran. Haran begot Lot.
28 And Haran died before his father Terah in his native land, in Ur of the Chaldeans.
29 Then Abram and Nahor took wives: the name of Abram’s wife was Sarai, and the name of Nahor’s wife, Milcah, the daughter of Haran the father of Milcah and the father of Iscah.
30 But Sarai was barren; she had no child.
31 And Terah took his son Abram and his grandson Lot, the son of Haran, and his daughter-in-law Sarai, his son Abram’s wife, and they went out with them from Ur of the Chaldeans to go to the land of Canaan; and they came to Haran and dwelt there.
32 So the days of Terah were two hundred and five years, and Terah died in Haran.
Genesis 12 (New King James Version)
biblegateway.com/passage/?book_id=1&chapter=12&version=50
1 Now the LORD had said to Abram:
“Get out of your country,
From your family
And from your father’s house,
To a land that I will show you.
2 I will make you a great nation;
I will bless you
And make your name great;
And you shall be a blessing.
3 I will bless those who bless you,
And I will curse him who curses you;
And in you all the families of the earth shall be blessed.”
Genesis 15 (New King James Version)
biblegateway.com/passage/?search=Genesis%2015;&version=50;
4 And behold, the word of the LORD came to him, saying, “This one [an Abram servant] shall not be your heir, but one who will come from your own body shall be your heir.”
5 Then He brought him outside and said, “Look now toward heaven, and count the stars if you are able to number them.” And He said to him, “So shall your descendants be.”
6 And he believed in the LORD, and He accounted it to him for righteousness.
7 Then He said to him, “I am the LORD, who brought you out of Ur of the Chaldeans, to give you this land to inherit it.”
Genesis 17 (New King James Version)
biblegateway.com/passage/?search=Genesis%2017;&version=50;
1 When Abram was ninety-nine years old, the LORD appeared to Abram and said to him, “I am Almighty God; walk before Me and be blameless.
2 And I will make My covenant between Me and you, and will multiply you exceedingly.”
3 Then Abram fell on his face, and God talked with him, saying:
4 “As for Me, behold, My covenant is with you, and you shall be a father of many nations. 5 No longer shall your name be called Abram, but your name shall be Abraham; for I have made you a father of many nations. 6 I will make you exceedingly fruitful; and I will make nations of you, and kings shall come from you. 7 And I will establish My covenant between Me and you and your descendants after you in their generations, for an everlasting covenant, to be God to you and your descendants after you. 8 Also I give to you and your descendants after you the land in which you are a stranger, all the land of Canaan, as an everlasting possession; and I will be their God.”
9 And God said to Abraham: "As for you, you shall keep My covenant, you and your descendants after you throughout their generations.