Isn't the Old Testament part of the Christian Bible?
It is, but the Old Testament didn’t become the first part of the Christian Bible, first. Early Gentile followers of Jesus were
not enamored by Judaism or Jews. But they ‘were’ enamored with Jesus, and they found patterns in the laws, narratives, and psalms of the Hebrew Bible that acted as metaphors and allegories that pointed to the Messiah, who
they recognized and believed to be Jesus. So they eventually adopted the Hebrew Bible as part of their own Christian scriptures.
