CAITLYN JENNER BIOGRAPHER SAYS HER CHRISTIAN BELIEFS ARE CAUSING GENDER STRUGGLE.

The real reason Caitlyn Jenner IS considering returning to being a man - by the man who broke the story. Kardashian biographer says Christian belief that it would be sinful to date women is behind gender struggle

IAN HALPERIN has written a new biography of the Kardashian clan - and revealed that Caitlyn Jenner's friends think she could revert to being Bruce

He writes exclusively for Daily Mail Online explaining the complex struggle for Jenner, 66, who is a devout Christian

Jenner wants to find love and believes it would be sinful to be in a same-sex relationship, which means something has to give

Friends say Jenner has been miserable in last couple of months while Kardashian sources say they believe she should complete transition

In the early 1990s Bruce Jenner had begun to transition to a woman but reversed process when he began dating Kris Kardashian