See page 3 of the instructions to form I601.
5. Applicants Seeking to Waive the Vaccination Requirement
If you seek an exemption from the vaccination requirement because the vaccination would be against your religious beliefs or moral convictions, you should file this form. You should establish with evidence that:
A. You are opposed to vaccinations in any form;
B. The objection is based on religious belief or moral conviction; and
C. The belief or conviction is sincere.
WC, I believe this is the part you are referring to?
I am reading up more on http://www.vaclib.org/links/religion.htm
Cheers!