Though it was known that he was committed to Christianity and destroyed shrines and temples in his later years, it was the behavior of Yoshishige who was said to dream of building the "Christian Kingdom" only in Hyuga Province of invading it, and no material was found to prove that Yoshishige destroyed shrines and temples in his home ground, Bungo Province.
後半生にキリスト教に傾倒し寺社仏閣を破壊したという話が知られているが、これは日向国侵攻においてキリスト教国建設を夢見たとされる義鎮が日向国内限定で行った行為であり、本拠である豊後国内で義鎮が寺社仏閣を破壊したことを示す資料は見当たらない。