My eldest DSD is attending a Catholic high school, with DSD2 all set to attend next year. Neither we, nor DH's ex are religious.

DH and his ex chose the school because it is a smaller school with a fantastic reputation. Like you, they were looking for a school with a good sense of community and the availiability of one-on-one teachers for the kids.

Neither girl was actually christened, and while the school 'prefers' students to be of Catholic background, it's not a big deal. All students attend church and lithergy (sp?) while at school, and instead of the girls looking at it negatively ("gah, we've got to go to church again, grumble grumble"), we try to encourage it as another subject... something else to learn about. And honestly, we look at that way too... we've all (myself, DH, his ex and her partner) have attended church functions with DSD1 and we just look at like any other school function.

HTH