I think that many people are in this category, that they know, they believe, and they still reject the truth.
But isn't there a difference between knowing you should do something but not doing it, and not even knowing in the first place?
So there is a difference between saying "I think the Bible is fairy tales and people made-up god, there is no such thing" versus saying "I really think there is a god, even Jesus, but I don't care"
Maybe I think eating activated charcoal isn't good for me, so I don't. Or maybe I do think it's good for me but I choose not to - - those are two different scenarios.
What getting at is that if it's like Jesus Himself explicitly said, that no one knows God except who God chooses to reveal Himself to, then it's not necessarily the case that salvation comes down to an individuals absolutely free choice. A person doesn't have that choice unless God first chooses to open their ear to hear and their heart to understand the gospel.