Throughout the 20th century, most Bissau-Guineans practiced some form of Animism. In the early 21st century, many have adopted Islam, which is now practiced by 50% of the country's population. Most of Guinea-Bissau's Muslims are of the Sunni denomination with approximately 2% belonging to the Ahmadiyya sect.
In the 20th century most people practiced some form of what faith?
Animism.