Translation guide
In Japanese, 'Muslim' can refer to a follower of Islam or be used as an adjective. The most common term is ムスリム, a loanword from English. There are also native Japanese terms like イスラム教徒, which is more formal and literally means 'Islam believer'. When referring to things related to Muslims, イスラム is often used as a prefix.
He is a Muslim.
Muslim community
The most common and neutral term, borrowed from English. Widely understood and used in everyday conversation and media.
He is a Muslim.
I have a Muslim friend.
Literally 'Islam believer'. More formal and often used in news or academic contexts. Can sound slightly stiff in casual conversation.
Muslims fast during Ramadan.
An older term, now less common and sometimes considered outdated or insensitive. Avoid unless in historical contexts.
This term can be perceived as old-fashioned or even derogatory. Use ムスリム or イスラム教徒 instead.
Muslim prayer (historical usage)
Describing things associated with Muslims, such as culture, food, or practices
Use イスラム (Islam) + の to mean 'Muslim' as an adjective. This is the most natural way to describe things related to Muslims or Islam.
Also possible, but less common than イスラムの for general adjectives. Often used when emphasizing the people rather than the religion.
Muslim community
ムスリム is the everyday term, while イスラム教徒 is more formal. In casual speech, ムスリム is preferred. In news reports or academic writing, イスラム教徒 is common.
I talked with my Muslim friend.
The Muslim population is increasing.
回教徒 is an outdated term that can be offensive. Stick to ムスリム or イスラム教徒.