Many Christians see a special spiritual significance in the Jewish people because Jesus, the apostles, and the first Christian communities were Jewish, and because the Christian Bible includes the Hebrew Scriptures as the first part of God's revelation. Christians therefore often feel a real but complex sense of connection, rooted in shared texts, history, and belief in the same Creator, alongside clear differences over Jesus and religious law.
There's also the following, which tends to dominate the Christian mind about the Jews role in God's domain:
Several Old Testament passages explicitly use "chosen" language for Israel (the Jewish people). The clearest example is in Deuteronomy:
Deuteronomy 7:6 "For you are a people holy to the Lord your God; the Lord your God has chosen you to be a people for his treasured possession, out of all the peoples who are on the face of the earth."