There are several Muslim countries that feature the crescent moon symbol on their national flag. See them and find out more about them here.
Crescent moon and star islam symbol Royalty Free Vector
Moon, Crescent Figure, Brass Moon iron Figurine, Turkish Flag Tip Concept Mosque
Why don't the Arab countries have crescent moon and stars on their flags, despite being Islamic? - Quora
Star and Crescent: Meaning of the Islamic Symbol - Symbol Sage
Flag of Pakistan. Capital Islamabad Stock Photo - Image of concept, capital: 151237688
Moon, Crescent Figure, Brass Moon iron Figurine, Turkish Flag Tip Concept Mosque
What does a crescent moon with a star symbolize? - Quora
64 countries have religious symbols on their national flags
Which National Flags Feature The Moon In Their Designs? - WorldAtlas
Flags of Muslim Countries With a Crescent Moon
National flag of Pakistan: crescent moon and star on green background with white vertical stripe on the left side Stock Photo - Alamy
The Muslim Kingdom and the Israeli Flag - Jewish Telegraphic Agency
Стоковая фотография 582588493: Azerbaijan Flag Crescent Moon Muslim Flags