The importance of water baptism has been understood in different ways throughout church history. Some groups have taught that water baptism is the means by which God forgives sins. Others have said that water baptism is a sign and a seal of being in a covenant relationship with God. Obviously this view is much more vague than the first one and allows for differences of interpretation. Yet a third view argues that since water baptism is only a symbol of what God has already done and since water baptism has caused great division within Christendom, either water baptism should not be performed at all or it should be made optional for church membership.