Here is the definition of Nominal Adherents.
The evangelical Lausanne Movement defines a nominal Christian as "a person who has not responded in repentance and faith to Jesus Christ as his personal Saviour and Lord"...[he] "may be a practicing or non-practicing church member. He may give intellectual assent to basic Christian doctrines and claim to be a Christian. He may be faithful in attending liturgical rites and worship services and be an active member involved in church affairs."