"Unshakeable faith" means having a strong and unwavering belief or trust in something or someone, even in the face of challenges or doubts. Full definition
Even though the subtext here about the genocidal lies that great civilizations are invariably built upon threatens to deflate the film's soufflé texture, the Marvel Universe's unshakeable faith in the clear delineation between good and evil luckily prevents Ragnarok from ever truly buying what Hela's selling. (slantmagazine.com)
Her work flowed from an unshakeable faith, a contagious fire that once lit in childhood never went out. (faith.org.uk)
Well, it was my unshakeable faith in God, my simple and frugal lifestyle and the Aloe, whose benefits I discovered upon my arrival in South Africa at the end of the nineteenth century. (naturalalternativestocancer.com)