
The new rule was announced Monday in a memo circulated to all ministries and departments, Jolloif News reported.
It came a month after President Yahya Jammeh declared the Muslim-majority country an Islamic republic.
On December 11, Jammeh said that "in line with the country’s religious identity and values, I proclaim Gambia as an Islamic state.”
"As Muslims are the majority in the country, the Gambia cannot afford to continue the colonial legacy,” he added.
He said that other citizens of other faiths would still be able to practice.
Gambia has a population of 1.8 million people and 95 percent are Muslim. The tiny West African nation, which borders Muslim majority Senegal, is now the second Islamic republic in Africa, after Mauritania.