I haven't read any of his stuff, so maybe I'm waaaay off the mark, but I had the impression that Graham Greene's stuff was political and more left-leaning than right-leaning (?) (Not the religion-oriented stuff, but like The Quiet American or Our Man in Havana) This, from the Wikipedia page on him:
The supernatural realities that haunted the earlier work declined and were replaced by a humanistic perspective, a change reflected in his public criticism of orthodox Catholic teaching. Left-wing political critiques assumed greater importance in his novels: for example, years before the Vietnam War, in The Quiet American he prophetically attacked the naive and counterproductive attitudes that were to characterise American policy in Vietnam. The tormented believers he portrayed were more likely to have faith in communism than in Catholicism. In his later years Greene was a strong critic of American imperialism, and supported the Cuban leader Fidel Castro, whom he had met.[34] For Greene and politics, see also Anthony Burgess' Politics in the Novels of Graham Greene.[35]
no subject
The supernatural realities that haunted the earlier work declined and were replaced by a humanistic perspective, a change reflected in his public criticism of orthodox Catholic teaching. Left-wing political critiques assumed greater importance in his novels: for example, years before the Vietnam War, in The Quiet American he prophetically attacked the naive and counterproductive attitudes that were to characterise American policy in Vietnam. The tormented believers he portrayed were more likely to have faith in communism than in Catholicism.
In his later years Greene was a strong critic of American imperialism, and supported the Cuban leader Fidel Castro, whom he had met.[34] For Greene and politics, see also Anthony Burgess' Politics in the Novels of Graham Greene.[35]