As long as he/she consults medical texts for information concerning the procedure to be performed on me, and not the Koran, Bible, Vedas, Zend Avesta or any other Bronze Age text.
You'd believe if you just opened your heart" is a terrible argument for religion. It's basically saying, "If you bias yourself enough, you can convince yourself that this is true." If religion were true, people wouldn't need faith to believe it -- it would be supported by good evidence.