In Kadiwéu, it is not possible to use a rhetorical question for the purpose of linking subjects as is done in Romans 4:1 in the Greek (and English) text. Instead, the translators translated the whole verse as “Our forefather Abraham, how did he become just (righteous) before God?” (Source: Glyn Griffiths in Notes on Translation June 1986, p. 25ff.)
See also here.