As Jews, we do not view Christians as sinners. We respect Christians. Of course there are enormous disagreements. I would not debate Judaism vs. Christianity vs. Islam -- especially on any forum.
Nevertheless, about 4.1 Billion people have very similar views. They believe most of Tanakh (Old Testament). They have almost the same idea of Afterlife. Faith alone does not save from Cleansing process, but it reduces the time of the process from millennia to years. Only life of Righteousness saves people from all suffering in Afterlife.