Why do claimed Christians talk about JW's GB when you have an RCC who believes he's "God in the earth" with authority to change Bible?

Update: “The Pope is of great authority and power that he can modify, explain, or interpret even divine laws... The Pope can modify divine law, since his power is not of man, but of God, and he acts as vicegerent of God upon earth." -Lucius Ferraris, Prompta Ribliotheca, " Papa," Part. 2, translated."
Update 2: "The Pope has the power to change times, to abrogate [to abolish, do away with, or annul] laws, and to dispense with all things, even the precepts of Christ." Decretal, de Tranlatic Episcop. Cap. (The Pope can modify divine law.) Ferraris' Ecclesiastical Dictionary."
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