In times past, what some thought to be "foundational" biblical truths, turned out to be misinterpretations of the Scriptures.
Hard to misinterpret this...
"For if God did not spare angels when they sinned, but cast them into hell and committed them to chains of gloomy darkness to be kept until the judgment; if he did not spare the ancient world, but preserved Noah, a herald of righteousness, with seven others, when he brought a flood upon the world of the ungodly;"
I sincerely doubt, in this day and age, that anything is being misinterpreted. And it is for this reason, alone, that there is a need by liberal "Christians" to cast doubt on the interpretations that have been long since proven.
Who needs faith in a Savior when there really is no such thing as sin?