Some reasons why people think that God exists.
In addition to these arguments for theism, Christians should be able to make a minimal facts case for the resurrection, one that leverages the early creed in 1 Corinthians 15:3-7. And some sort of case for the belief that Jesus was divine using only the earliest sources.
In addition to those positive evidences, there would be informed defenses to other questions like the problem of evil, the problem of suffering,religious pluralism, the hiddenness of God, materialist conceptions of mind, consciousness and neuroscience, the justice of eternal damnation,sovereignty and free will, the doctrine of the Incarnation, the doctrine of the Trinity, and so on.See also, "So you think you understand the cosmological argument?"