Muslim population (% of their total population):

Mauritania 🇲🇷 - 99.9%
Somalia 🇸🇴 - 99.8%
Tunisia 🇹🇳 - 99.8%
Afghanistan 🇦🇫 - 99.6%
Iran 🇮🇷 - 99.4%
Turkey 🇹🇷 - 99.2%
Yemen 🇾🇪 - 99.1%
Algeria 🇩🇿 - 99%
Morocco 🇲🇦 - 99%
Maldives 🇲🇻 - 98.4%
Niger 🇳🇪 - 98.3%
Palestine 🇵🇸 - 97.5%
Jordan 🇯🇴 - 97.2%
Saudi Arabia 🇸🇦 - 97.1%
Sudan 🇸🇩 - 97%
Libya 🇱🇾 - 97%
Azerbaijan 🇦🇿 - 96.9%
Tajikistan 🇹🇯 - 96.7%
Pakistan 🇵🇰 - 96.5%
Uzbekistan 🇺🇿 - 96.5%
Iraq 🇮🇶 - 95.7%
Syria 🇸🇾 - 93%
Egypt 🇪🇬 - 92.3%
Bangladesh 🇧🇩 - 90.4%
Indonesia 🇮🇩 - 87.2%
Kyrgyzstan 🇰🇬 - 80%
Qatar 🇶🇦 - 77%
UAE 🇦🇪 - 76%
Kuwait 🇰🇼 - 74%
Kazakhstan 🇰🇿 - 70%
Malaysia 🇲🇾 - 61%
Albania 🇦🇱 - 58%
Lebanon 🇱🇧 - 57%
Tanzania 🇹🇿 - 35%
Israel 🇮🇱 - 18%
Singapore 🇸🇬 - 14%
India 🇮🇳 - 14%
Russia 🇷🇺 - 13%
France 🇫🇷 - 8.8%
UK 🇬🇧 - 6.3%
Germany 🇩🇪 - 5.7%
Greece 🇬🇷 - 5.7%
Italy 🇮🇹 - 4.8%
Canada 🇨🇦 - 3.2%
Australia 🇦🇺 - 2.6%
USA 🇺🇲 - 1.1%
Argentina 🇦🇷 - 0.9%
Brazil 🇧🇷 - 0.36%
Japan 🇯🇵 - 0.1%
North Korea 🇰🇵 - 0.01%
Vatican City 🇻🇦 - 0%