Reza Aslan, the author of “Zealot,” a provocative new biography of Jesus, has found an inadvertent ally in generating book publicity: Fox News.

In an interview on Friday that was by turns bizarre and uncomfortable, Lauren Green, a host from “Spirited Debate,” a weekly Fox News webcast, pressed Mr. Aslan on the question of why, as a Muslim, he would choose Jesus as his subject.

“You’re a Muslim, so why did you write a book about the founder of Christianity?” Ms. Green asked.

“Well, to be clear,” Mr. Aslan said, his eyebrows lifting up in surprise, “I am a scholar of religions with four degrees, including one in the New Testament, and fluency in biblical Greek, who has been studying the origins of Christianity for two decades, who also just happens to be a Muslim.”

The nearly 10-minute video clip quickly entered the Internet bloodstream on Saturday after it was posted on Buzzfeed with the irresistibly clickable headline, “Is This The Most Embarrassing Interview Fox News Has Ever Done?”