What does it mean to be a Christian in the 21st century? Can one be a Christian and yet doubt the virgin birth or the Resurrection? I put these questions to the Rev. Timothy Keller, an evangelical Christian pastor and best-selling author who is among the most prominent evangelical thinkers today. Our conversation has been edited for space and clarity.

KRISTOF Tim, I deeply admire Jesus and his message, but am also skeptical of themes that have been integral to Christianity — the virgin birth, the Resurrection, the miracles and so on. Since this is the Christmas season, let’s start with the virgin birth. Is that an essential belief, or can I mix and match?