Katie Holmes reportedly divorced Tom Cruise because she does not want their daughter to become a Scientologist.

Holmes, 33, wants sole custody of six year-old Suri, so she can control the child's religion and schooling, claims The Sun. Divorce papers filed in New York by Holmes this week cite 'irreconcilable differences' as the reason for the split.

The Sun quotes a source as saying: "At the same time, Tom will file for divorce in California and will request joint custody of Suri. There is absolutely no way he is going to let Katie have sole custody. The lines are being drawn and this is going to shape up as a very contentious custody battle."

katie holmes

Scientology worries: Katie Holmes reportedly didn't want Suri to be inducted

A source adds, "Katie has found the set-up extremely suffocating at times. One of the main things she and Tom fought over was his family. His mum was always around everywhere they went and so were his sister and kids. They all lived in the same mansion. But even though the house is huge it just became too much for Katie."

Another source quoted by the paper said Holmes was "terrified" for Suri's future if she was inducted into Scientology.

Cruise, who turns 50 on Tuesday, is currently filming his new movie Oblivion in Iceland and is said to be stunned by the divorce action.