Who was a Swiss theologian and humanist philosopher that rejected the principle of transubstantiation and believed in the supreme authority of the Bible rather than the clergy?

Answer 1

You'd have your answer more quickly if you'd gone straight to Google.

https://www.google.com/search?source=hp&ei=howaXJjFOIvAtQWE-4HACA&q=Swiss+theologian+and+humanist+philosopher+that+rejected+the+principle+of+transubstantiation+&btnK=Google+Search&oq=Swiss+theologian+and+humanist+philosopher+that+rejected+the+principle+of+transubstantiation+&gs_l=psy-ab.3...4516.4516..5326...0.0..0.103.103.0j1......0....1j2..gws-wiz.....0.HR_-AwZwliI

Answer 2

Huldrych Zwingli