Answer by taking a quote from the following article:

Alberto Kenya Fujimori Fujimori (Spanish: [al'berto fuxi'mori, fuji-]; Japanese: [FWzimori]; born 26 July 1938 or 4 August 1938) served as the President of Peru from 28 July 1990 to 22 November 2000. His government is credited with the creation of Fujimorism, defeating the Shining Path insurgency, and restoring Peru's macroeconomic stability. Fujimori ended his presidency by fleeing Peru for Japan amid a major scandal involving corruption and human rights violations. Even amid his prosecution in 2008 for crimes against humanity relating to his presidency, two-thirds of Peruvians polled voiced approval for his leadership in that period.

Fujimori obtained his early education at the Colegio Nuestra Senora de la Merced and La Rectora. Fujimori's parents were Buddhists, but he was baptised and raised as a Roman Catholic. While he spoke mainly Japanese at home, Fujimori also learned to become a proficient Spanish speaker during his years at school. In 1956, Fujimori graduated from La gran unidad escolar Alfonso Ugarte in Lima.  He went on to undergraduate studies at the Universidad Nacional Agraria La Molina in 1957, graduating in 1961 first in his class as an agricultural engineer. The following year he lectured on mathematics at the university. In 1964 he went to study physics at the University of Strasbourg in France. On a Ford scholarship, Fujimori also attended the University of Wisconsin-Milwaukee in the United States, where he obtained his master's degree in mathematics in 1969. In 1974, he married Susana Higuchi, also Japanese-Peruvian. They had four children, including a daughter, Keiko, who followed her father into politics. In recognition of his academic achievements, the sciences faculty of the Universidad Nacional Agraria offered Fujimori the deanship and in 1984 appointed him to the rectorship of the university, which he held until 1989. In 1987, Fujimori also became president of the National Commission of Peruvian University Rectors (Asamblea Nacional de Rectores), a position which he has held twice. He also hosted a TV show called "Concertando" from 1988 to 1989, on Peru's state-owned network, Channel 7.  Fujimori won the 1990 presidential election as a dark horse candidate under the banner of Cambio 90 ("cambio" means "change") beating world-renowned writer Mario Vargas Llosa in a surprising upset. He capitalized on profound disenchantment with outgoing president Alan Garcia and the American Popular Revolutionary Alliance party (APRA). He exploited popular distrust of Vargas Llosa's identification with the existing Peruvian political establishment, and uncertainty about his plans for neoliberal economic reforms.  During the campaign, Fujimori was nicknamed El Chino, which roughly translates to "Chinaman"; it is common for people of any East Asian descent to be called chino in Peru, as elsewhere in Latin America, both derogatively and affectionately. Although he is of Japanese heritage, Fujimori has suggested that he was always gladdened by the term, which he perceived as a term of affection. With his election victory, he became just the second person of East Asian descent to become head of government of a Latin American nation, after Fulgencio Batista of Cuba and the third of East Asian descent to govern a South American state, after Arthur Chung of Guyana and Henk Chin A Sen of Suriname (each of whom had served as head of state, rather than head of government).

Why did they raise him as Roman Catholic?