Travolta under scientology 'gag order'

John Travolta

John Travolta has reportedly promised not to mention his Scientology religion when he appears on a German TV talk show later this month.

The Grease star is to make an appearance on Wetten, Dass...? on March 31, but local politicians are worried he'll use the interview to promote his religion as a new Scientology center is opening in Freiberg, Germany, around the same time.

Local TV network ZDF claims to have spoken to Travolta's management to request the star only promotes his new movie Wild Hogs--and not Scientology.

However, the network insists there is no relation between Travolta's visit and the opening of the center.