I listened to the spot and that's not quite a fair assessment. He's clearly speaking of unbelievers, not Christians, who have taken the mark of the beast, and then repent and come to Christ. Your statement "how many Christians will be damned to the lake of fire..." isn't his point. He's not talking about Christians at all. He's talking about the unsaved who come to Christ. I take it you're saying that no one will be saved during the final years of the tribulation.