A muathan is the person who calls Muslims to worship. The call itself is called the "athan." The caller is the "muathan." In some dialects "th" is pronounced "z"; hence, the term muessan or muzzein. A muathan is the person who calls Muslims to worship. The call itself is called the "athan." The caller is the "muathan." In some dialects "th" is pronounced "z"; hence, the term muessan or muzzein.