What was Christianity called in the old testament?

In the Old Testament, Christianity did not exist as a distinct religion; instead, the texts primarily reflect the beliefs and practices of ancient Israelite religion, which is often referred to as Judaism. The Old Testament outlines the covenant between God and the Israelites, focusing on laws, prophecies, and the history of the Jewish people. The term "Christianity" emerged later, after the life and teachings of Jesus Christ, who is seen as the fulfillment of Old Testament prophecies within the Christian tradition.