Notwithstanding any provisions herein to the contrary, nothing in this chapter shall be construed to require a private facility to honor an agent's health care decision that the facility would not honor if the decision had been made by the principal because the decision is contrary to a formally adopted policy of the facility that is expressly based on religious beliefs and the facility would be permitted by law to refuse to honor the decision if made by the principal, provided:
Mass. Gen. Laws ch. 201D, § 15