Is it permissible for a Muslim to hold the citizenship of a country that is not their original homeland, and to benefit from all the rights of citizenship therein, while not feeling a sense of belonging to that country, and having the ease of relinquishing this citizenship, especially if it facilitates their life and travel?

Nationality is a modern political term that was not known to early jurists. Its granting is not restricted to the original citizens of the country; rather, it is an acquired right based on multiple reasons. What has been mentioned does not prevent one from holding a granted nationality, and there is no harm in holding it and benefiting from its rights.