I think Katie got caught up in the fantasy of being with and marrying Tom Cruise. I bet TC wined and dined her and she couldn't believe Tom Cruise a famous movie star chose her. I'm guessing she didn't really see the problems of his control and Scientology would have over her. If she did start to see it, once she was

, I'm betting she was determined to make it work.
I was reading on Scientology and watching youtube videos and they don't tell you everything they believe at first. They make it look more like a self help group. That they will make you a better person. So they would have kept Katie clueless on what they believed.
I think the reason TC settled so quickly is because the COS told him to. They were getting bad publicly out of this.
Sure they will see Katie as a Suppressive Person but I'm sure they are hoping to influence Suri someday. Katie plans right now is to raise Suri Catholic.
What you really learn about COS is they are making huge profits off of people by telling them there is something wrong with them and they can fix it. You would think that if they really cared about people it wouldn't be about the money. Sounds like Republicans.