Christianity vs Other Religions: What separates Christianity from all other religions? [Romans 8:9]. The Atonement: Why did Jesus have to die? [Isaiah 53:6, 1 Peter 2:24, Revelation 12:10, John 8:34, Romans 8:33, Mark 10:45, 1 Timothy 2:6, 1 Corinthians 5:19-21].