Eternity in hell as a punishment for sin seems out of proportion with most people's lives which last for a relatively few years, and include plenty of good
Jesus treated people who were seen as outcasts or unclean with dignity and love and criticised hypocrites who felt they were better than others. This shows that Christianity has a balanced view of human beings, seeing both the positive and negative
It may make Christians repent from their sins, and seek forgiveness from God
They may feel love and gratitude to Jesus for his sacrifice, and work to become a better Christian, living by Jesus' example and following his teaching
They may feel that there is little they can do about sin, that it is a part of them that they cannot change, this could be seen as a negative way of thinking and lead to feelings of shame, or it could lead to them excusing actions as something they cannot control
It may make Christians feel closer to God as they know that through his grace they can be forgiven for their sins
They may look for ways to help others to find God's forgiveness, e.g. through spreading the Christian message
When human beings go against God's will, they are misusing free will, so it can be seen as a cause of suffering and alienation from God, the world and each other