Rubbish ! - the Irish were not 'exiled' to the IoM - many irish came (see
http://www.ee.surrey.ac.uk/Contrib/manx/famhist/genealgy/imig.htm
- Roman Catholics were not particularly liked by the Manx until late 19th C
but they were numerous enough to build an impressive church (St Mary's)

I'm not getting at you personally but it worries me that people can believe such myths