* "It is going to happen," US Christian broadcaster says
* Says true believers to go to heaven, others left behind (Adds comments from "Left Behind" author and atheists)
By Gabrielle Saveri
SAN FRANCISCO, May 19 (Reuters) - The U.S. evangelical Christian broadcaster predicting that Judgment Day will come on Saturday says he expects to stay close to a TV or radio to monitor the unfolding apocalypse.
Harold Camping, 89, previously made a failed prediction that Jesus Christ would return to Earth in 1994.
The head of the Christian radio network Family Stations Inc says that he is sure an earthquake will shake the Earth on May 21, sweeping true believers to heaven and leaving others behind to be engulfed in the world's destruction over a few months.