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From The Collaborative International Dictionary of English v.0.48:
Unprotestantize \Un*prot"es*tant*ize\, v. t. [1st pref. un- + protestantize.] To render other than Protestant; to cause to change from Protestantism to some other form of religion; to deprive of some Protestant feature or characteristic. [1913 Webster] The attempt to unprotestantize the Church of England. --Froude. [1913 Webster]