This person sounds as if he’s gotten all sorts of other things tangled up with his purported Christianity, which leads him to think that he knows something that the Bible itself tells him he cannot know. He can’t be all that much of a Christian, otherwise he’d know this. Therefore, I suspect that a lot of these people aren’t actually Christian, and they’re attempting to sow disbelief in order to discredit authentic Christians.
False prophets and false Christs will abound....................