Only about 2% of the population speaks Portuguese, the official language, as a first language, and 33% speak it as a second language. However, Guinea-Bissau Creole is the national language and also considered the language of unity. According to a 2012 study, 54% of the population speak Creole as a first language and about 40% speak it as a second language. The remainder speak a variety of native African languages. There are diverse religions in Guinea-Bissau. Christianity and Islam are the main religions practised in the country. The country's per-capita gross domestic product is one of the lowest in the world.