If a Moabitess converts to Judaism can she be the grandmother of a King of Israel and have the Messiah as her descendant ?
And they lifted up their voice, and wept again: and Orpah kissed her mother in law; but Ruth clave unto her. And she said, Behold, thy sister in law is gone back unto her people, and unto her gods: return thou after thy sister in law. And Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Where thou diest, will I die, and there will I be buried: the Lord do so to me, and more also, if ought but death part thee and me. When she saw that she was stedfastly minded to go with her, then she left speaking unto her.
Ruth, Catholic chapter one, Protestant verses fourteen to eighteen,
as authorized, but not authored, by King James
“If a Moabitess converts to Judaism can she be the grandmother of a King of Israel and have the Messiah as her descendant ?”
Sure. But conversion to Judaism didn’t grant her a personal claim to the Holy Land. She was a stranger who married into the royal family of the Biblical chosen people. She herself was a foreigner with no special heritage or ancestral membership to the chosen people. And that by no means demonstrates that a person who converted to Judaism after the coming of Christ shares in God’s Old Covenant promise to Abraham.