What does the Bible say about the origins of Christianity?

Christianity, according to the Bible, has its origins in the everlasting covenant of grace established before the foundation of the world, as shown in Ephesians 1:4-5, where God chose a people in Christ before creation. This means that the essence of Christianity predates the establishment of Judaism and was formulated in God's eternal purpose. The misconceptions that Christianity is one of the youngest religions or merely an offshoot of Judaism are simply not true; its foundations are established in eternity.