Learn how to say Moslems correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Muslim:
a follower of the religion of Islam.
relating to Muslims or their religion.
early 17th century: from Arabic, active participle of ‘aslama (see Islam)
Muslim is the preferred spelling for ‘a follower of Islam’, although the form Moslem is also used. The archaic term Muhammadan (or Mohammedan) is not favoured by Muslims and should be avoided.