Rupert Grint was born in Hertfordshire, England.
Grint hasn't expressed his religious views. Most Q&A sites seem to agree that he's Christian, which is no surprise, considering he's a white Englishman. A clue to his denomination might be that he attended a Catholic school as a child.
The absence of politics
Grint hasn't had much to say about politics either. He did, when talking about his love of punk music, indicate a possible interest in the idea of no government, saying:
I love the madness behind [punk music]. The craziness, the passion. And the whole anarchist thing is quite cool.
However, he's young, rich, and famous and his pals Daniel Radcliffe and Emma Watson are both pretty liberal, so my guess is Grint is a gay rights promoting, environmentalist liberal.