 The Twa are a forest-dwelling pygmy people and are often considered descendants of Rwanda's earliest inhabitants.Scholars disagree on the origins of and differences between the Hutu and Tutsi; some believe differences are derived from former social castes within a single people, while others believe the Hutu and Tutsi arrived in the country separately, and from different locations.Christianity is the largest religion in the country; the principal language is Kinyarwanda, spoken by most Rwandans, with English and French serving as additional official languages.