Biblical Christianity refuses to separate historical fact from spiritual meaning. Its core claim is that the living God has acted in history, especially in the life, death, and resurrection of Jesus. Other religions tell people what they must do to achieve salvation, or become holy, or reach Nirvana, or connect with the divine. The burden of obligation is on the individual to perform the right ceremonies or perfect the right rituals. The Christian gospel is unique because it is the narrative of what God has done in history to accomplish salvation.
Liberal theologians typically give up the historical claims of Christianity for what they say is some deeper spiritual or ethical core. But if you strip away the history, there is no core left. If God has not acted in history to accomplish salvation, then there is no “good news” to tell…. As Paul told first-century audiences, if Jesus was not resurrected from the dead, if the tomb was not empty, then the Christian faith is based on a lie and is worthless (1 Cor. 15:17). He even urged his listeners to confirm the claim by seeking out the five hundred eyewitnesses who had seen the risen Christ. Paul was using a legal term, which means he was treating the resurrection like any other event that could be tested for its veracity. The central claim of Christianity was a stubborn historical fact, which was open to empirical investigation and knowable by ordinary means of historical verification.
The apostles were treating the resurrection in a way akin to what scientists today call a crucial experiment—an event that confirms or disconfirms an entire theory (or an entire theology). In their minds, historical facts and spiritual truths must cohere. Facts and faith must agree. Truth is a unity.
—Nancy Pearcey in Saving Leonardo: A Call to Resist the Secular Assault on Mind, Morals, and Meaning