If someone claims that the Bible has been corrupted, they have immediately revealed themselves to be a false teacher. Consider this, why would God give us scripture as a means to test teachers, allow that scripture to become corrupted, and then send us another teacher, with no means to test him?
If God had allowed scriptures to become corrupted, and their meanings lost, then we would cease to have any way of knowing God’s truth. For even if after this supposed corruption God were to send a prophet to restore truth, how would we know that it is indeed truth, with no test, anything this prophet says is suspect.
If God were to allow scriptures to become corrupted, that would make it impossible for us to know when He speaks to us. There simply would be no way of knowing if a person is a true prophet of God, or a false prophet teaching doctrines of demons, as any conflict with scripture can simply be excused with the accusation of corruption.”
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Acts 17:11; “These (Bereans) were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.”
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Mormon Doctrine, p. 69 “As to the papyrus rolls which the Prophet had, after his death they fell into the hands of apostates and enemies of the Church. As far as is known they were destroyed in the great Chicago fire in 1871. But the day shall come when the Book of Joseph shall be restored and its contents shall be known again. This we know because the Brass Plates themselves are yet to be translated and sent forth “unto every nation, kindred tongue, and people.” (Alma 37:3-5.)” – Bruce McConkie