Tom Cruise: Scientology did not cause split with Katie Holmes

Katie submitted papers to end the marriage last week amongst claims that she was concerned that six-year-old daughter Suri was to be subjected to auditing and sent to the Sea Organisation - a floating Scientology school.

A source close to Tom said: "[Katie] was totally committed to Scientology. She had enthusiasm for it and would voluntarily and gladly participate in it when Tom was off shooting movies.

"This is not a fight over religion. It's being used as a way to hurt Tom."

Despite Tom's apparent belief, Katie has reportedly stepped up her security amid fears she is being "spied on" by Scientology leaders, with her parents receiving hourly reports on her whereabouts.

A source told RadarOnline.com: "Katie's father and mother are in constant communication with their daughter. They are being told what she is doing and where she is with Suri. One of Katie's bodyguards is also calling her father throughout the day and night to inform him of Katie and Suri's physical location and there is an electronic security log that Katie's parents receive that is updated hourly.

"Katie is taking these extraordinary measures for obvious reasons. She knows now that in the eyes of Scientology she is the enemy. Her father advised her to spare no expense in hiring the best security team possible. "