The State of Illinois prohibits all forms of discrimination, disqualification, coercion, disability or imposition of liability upon such persons or entities [engaged in, the delivery of, arrangement for, or payment of health care services and medical care] by reason of their refusing to act contrary to their conscience or conscientious convictions in refusing to obtain, receive, accept, deliver, pay for, or arrange for the payment of health care services and medical care.
So, in Illinois, the medical standard of care is the conscience of your healthcare personnel--from the admitting clerk, to your physician and nurse, to your orderly and OR cleaning staff. [If you think that, in order for a patient to receive proper care, the only people that matter are the physicians and the nurses, you are sadly mistaken.]
And how, you might ask, is this medical standard of "conscience" defined? Fret not; our beloved politicians provide the answer (emphasis mine):
(e) "Conscience" means a sincerely held set of moral convictions arising from belief in and relation to God, or which, though not so derived, arises from a place in the life of its possessor parallel to that filled by God among adherents to religious faiths; and
Brilliant! Because nothing is more conducive to proper medical care than State-issued religious regulations.