Mengele abandoned his Catholic Faith. In fact, in his post-WWII journal, Mengele specifically wrote, “We had to liberate Germanic history from Roman and Catholic influences.”
National Catholic Register, Matthew Archbold; In the early 1990’s, Argentine authorities opened its archives to reveal that several Nazi war criminals found safe haven in South America, including Dr. Josef Mengele, also known as Auschwitz’s Angel of Death. Mengele is infamous for his horrific experiments on inmates at the concentration camp. According to The New York Times in 1992, Mengele entered Argentina using a Red Cross-issued passport in 1949 and “practiced medicine in Buenos Aires for several years in the 1950s,” specializing in illegal abortions. More here.