I believe there is still a 'religious' option to declining shots for school. I used it when the school decided every 9th or 10th grader should get a shot for something ... can't even remember now ... some stupid thing ... and I said NO WAY and just used to 'it's against my religion' option.
Unfortunately this does not work in all states. Some states have revoked people's rights to refuse the vaccines on religious grounds. Here is an old post on the subject of exemption though: