The real issue is that Protestantism relies on a set of books as infallible but doesn't know where it came from.

Christianity predates the Bible. The Bible was compiled for the faithul by the Church. Jesus didn't leave a list and didn't say what to put into the Canon, and so He delegated that task to His Church. Protestants unknowingly put trust in the council fathers who decided and promulgated the Canon, except then rejecting seven entries, more than a full millennium later. After that confusion, the Church then ratified the original Canon.

The scriptures themselves say the Church is the pillar and foundation of truth, not vice versa. KJV onlyism is a subset of Sola Scriptura, which is itself untenable.

Additionally, the original KJV includes the deuterocanon (the books rejected by most protestants today), and was illegal to print without it until much later. As an added bonus, there is a conspicuous omission of references to tyrants in it, almost assuredly at the request of that English king.