As footballing entities, Jersey, Guernsey and Isle of Man are considered to be part of England because they are affiliated to the FA of England, and receive money from the FA of England for their development. Until they break away from the FA, they do not have much chancee of being treated as independent football entities.
But in terms of football, one FIFA member cannot be in control of another, they need to be independent.
Suriname, Curaçao (aka Netherlands Antilles) and Dutch East Indies FA used to be affiliated with KNVB. Suriname and Dutch East Indies until they became independent. Yet they were being treated as independent football entities as they even had their own FIFA membership. At 1938 Worldchampionships KNVB was even represented with two separate teams: Netherlands and Dutch East Indies.
So following to KNVB affiliated members were FIFA member:
-> 1904-1929 Netherlands
-> 1929-1930 Netherlands, Suriname
-> 1930-1932 Netherlands, Suriname, Dutch East Indies
-> 1932-1945 Netherlands, Suriname, Dutch East Indies, Curaçao
-> 1945-1975 Netherlands, Suriname, Curaçao (from 1948 as Netherlands Antilles)
-> 1975-1986 Netherlands, Netherlands Antilles
-> 1986- Netherlands, Netherlands Antilles (from 2010 Curaçao), Aruba.
Please take notice the dependencies had (Dutch East Indies until 1945, Suriname until 1975) and have (Curaçao and Aruba) the same status as i.e. Jersey or Gibraltar.