Christians don't need to 'atone' for their sin, because they believe that Jesus (God's son) died on the cross for everyone's sins, and therefore that's the ultimate atonement for sin.
often that is the case, though very rarely there are conversions to different religions. Many people lapse from the faith, either to agnosticism/atheism or to other faiths. Although one cannot 'undo'...
One opinion: No, he doesn't expect us to do anything but try our best not making sins, and to just believe he died for you. Another opinion: Yes, for the Bible is the word of God. It's the way God...
there beliefs. many faiths (religions) poise as christian faiths. true cristian faiths believe god, not a god but "the god" sent his one and only son to die on the cross for our sins.