Question: Do the people of Israel belong to one spiritual root?
Answer: Israel is not a nationality or a people. This is a group of people who have gathered in order to direct themselves to the Creator.
All those who wish to reach the Creator are called Israel. For them there is the holiday Rosh Hashanah (New Year) when they want to determine that from this moment onward they go to the Creator.
From the Daily Kabbalah Lesson 9/16/23, “Rosh Hashana“