[CynicalBear]

>>Then why does Protestantism deny the possibility of the Holy Spirit interpreting by or through the Magisterium,<<

And because the interpretation of the magisterium in too many instances is either not supported by scripture or is directly contradicted by scripture.

[Natural Law]

"And because the interpretation of the magisterium in too many instances is either not supported by scripture or is directly contradicted by scripture."

Then you must be sure that your interpretations are infallible? Where you differ with Christians other than Catholic, which of you is in error? And how sure are you then that the Church has delivered to you a complete and accurate Bible. Why do you accept the Letters to the Hebrews and reject the Shepherd of Hermes, accept Revelation and reject the Apocalypse of Peter, and accept James and Jude and reject First and Second Maccabees, if not by the infallible guidance of the Church that established the Canon?

Peace be with you

[metmom]

Well, if people are incapable of correctly interpreting Scripture, what makes anyone think those same people could correctly interpret the magisterium?