Probably more damaging than that. One of their techniques has been to force a new-and-still-enthusiastic member to do something illegal (e.g. breaking into psychiatrists' offices and stealing files), and document the crime. Cruise's career has held on fine despite widespread speculation as to his orientation. However, well-documented evidence of a burglary, or a statutory rape, would do him in.
Don't forget their auditing --- basically confessional therapy with a lie detector. You are also supposed to confess for crimes in "past lives."
Files are kept on all that is said.
Who knows what Cruise has confessed.
Well that, and he's gay.