christians believe that god incarnated in a human body, through the normal birth process, normally growing up into a man named jesus or (yeshua), coming to earth specifically to give every person an opportunity of salvation from their own evil, called sin. the effect of personal evil far transcends the repercussions humans cause to one another in the world, but affects one's relationship with god the father, and that aspect of the self cannot be addressed through one's own self-improvement efforts, but requires god to intervene in order to set one right. when jesus prayed and talked to god, he called him "father," and taught others to do the same.