A curious specimen of belief is that of the person who has converted not to a new religion, but a new nationality. Often, the results are similar.
The person who converts to another nationality will often adopt for himself the most idealised, rosy picture of their new identity. They take everything about their new identity a little bit too seriously, and won't relax.
They don't really understand what they have joined, but they are suddenly a big zealot about it and want to fight for it.
Mr Freedom
Those types of people I am referring to will often go to ridiculous extremes to label themselves as part of their new identity, possibly even having a flag or symbol tattooed on their bodies. Some of them might alter their names to something ridiculous, that they think fits their new nationality.
This may be the case with some Indian converts to Britishness, although I can't be sure and don't want to unfairly caricature a group of people. They may idolise the British monarch and wear jewellery featuring Union Jacks and state symbols - something few normal British people would do.
Worst of all, these new adoptees of the nation will often defend any policy of the government, even if they do not understand it, and will be quick to call others traitors. They become the worst caricature of chauvinism.
Immigrants against immigration
Although they are immigrants, the types of individuals I am talking about will often seek out right-wing groups and denigrate other immigrants. In fact, these immigrants often want to stop immigration, slamming the door on others just like them who would have followed them.
Joining a different community, a different culture, is a bit more complicated than getting a passport or being confirmed in a church. In fact, when people like this adopt the new identity and become militants in its name, they accidentally denigrate and mock their new community.
They turn themselves into a parody of the identity they hoped to join, they mistakenly insult the flags they hoped to wave. They doom themselves to be the butt of jokes, rather than truly accepted into the nation.
Infiltrators
Sometimes, people join a new nation or religion in hope of inciting it to war against those they do not like.
It may also be the case with asylum seekers. Asylum seekers, as opposed to economic migrants, are prone to be critics of the regime in their former country, and therefore may advocate a war against their former country, as Cuban refugees in Miami do. These are not model citizens. Their grudges have turned them into snakes, who imperil their new adoptive country with a conflict not in its interest.
People who remain part of their community of birth seem more likely to be mature, balanced individuals. The best immigrants will still carry their original national identity and pride with them somewhere.
There is a reason why countries are careful about who they accept as new citizens, and why the process often takes long. It is meant to filter out obvious evildoers, but also the unbalanced people and those with false expectations or understandings.