Description #1
A person from a democratic country hates democracy and loves communism. So, he moves to a communist country.
People from the communist country don't like him as he is a citizen of a democratic country and a foreigner.
So, he moves back to his previous country. Now, people there also hate him because he hates democracy.
Now, he is an orphan or pariah.
Description #2
A person changes his religion from 'X' to 'Y.' However, he is not regarded as a member of the community of 'Y' because he was not born with that religion. Now, the community of 'X' also disowns him because of his conversion.
Now, he is an orphan or pariah.
What phrase or idiom can I use to describe the person?