'Jesus Dynasty': Were There Two Messiahs?

Israel remains a land of holiness and of controversy -- and not just in political terms.

Almost by the month, religious scholars and historians propose a new way of understanding the life and impact of Jesus Christ. In his new book "The Jesus Dynasty," James Tabor is the latest addition to this hotly contested catalog.

Tabor, a historian with the Religious Studies Department at the University of North Carolina, Charlotte, has spent his entire career studying the life of Jesus. He says his new book is the culmination of 40 years of research.

"I first traveled to the Holy Land with my parents over 40 years ago," Tabor told "Nightline." "It was that experience that set me o