S.L.
It's super easy. They usually give you a form to fill out the dates that your child received each vaccine. On that form there is a spot for religious exemption and a spot for medical exemption. Sign the religious exemption, you don't have to show or prove any religious reason. You can even get some vaccines and not others. The only catch is that if there is an outbreak of an infectious disease that is vaccinated for, like pertussis or chicken pox, you will need to remove your child from school until the outbreak is over. There are no other hoops to jump through.