No where is Kenneth's religion even suggested, much less imposed on others. He is annoying in that he loves to argue and make people despise him.
Roy and Rosemary were never married; he was Rosemary's ex-boyfriend but stalks her against her will.
Didn't Rosemary and Jack's father only divorce 5 years before the story was set? This would have meant that jack was 5. Also, didn't he have the option to go with his father if he wanted? I'm not sure though, I'm just a little confused