It's absurd for someone who claims the Holy Spirit could not protect His Word from error and it took a sixteenth century heretic to do what the Holy Spirit couldn't to ask for proof of anything. Proof means nothing to such folks, they simply dismiss anything that doesn't agree with their preconceptions the same way they throw Scripture in the trash can when it doesn't agree with their preconceptions.
People in little Gnostic cliques prefer lies to the Truth so they repeat lies and even throw Scripture in the trash can rather than deal with the Truth.