I don't think it's something unique to religion. Some kids are very adventurous, embrace new ideas and try new things. Some try and live a very similar life to their parents as they don't like the discomfort of trying something they haven't done before.
Take me and my brother. My brother is in the same profession as my Dad, plays the same sports as my Dad and lives a very similar life (plans to go on to get married/have kids). I on the other hand do a job no-one in the family has ever done, the sports I do are almost all different and I don't plan to get married or have kids. We're not from a religious family so both are not believers, but I think he'd be a lot more likely to be if we were, as he just prefers the comfort and familiarity of being very similar to our parents and rarely embraces something alien to him. I on the other hand enjoy trying new things and embracing new ideas.
So perhaps some are comfortable without the comfort blanket religion provides and are happy disagreeing with their parents, whilst for others they're just much happier going along with it as it makes their life more enjoyable and stress free.
Take me and my brother. My brother is in the same profession as my Dad, plays the same sports as my Dad and lives a very similar life (plans to go on to get married/have kids). I on the other hand do a job no-one in the family has ever done, the sports I do are almost all different and I don't plan to get married or have kids. We're not from a religious family so both are not believers, but I think he'd be a lot more likely to be if we were, as he just prefers the comfort and familiarity of being very similar to our parents and rarely embraces something alien to him. I on the other hand enjoy trying new things and embracing new ideas.
So perhaps some are comfortable without the comfort blanket religion provides and are happy disagreeing with their parents, whilst for others they're just much happier going along with it as it makes their life more enjoyable and stress free.