Claiming that the bread and wine in the Sacrament actually changes into the physical body and blood of Jesus has led the people to worship and adore a piece of bread. This is a doctrinal distortion. Doctrinal definitions are not divorced from life. They actually determine the nature and expression of the Christian life. It is also important to understand that doctrinal definitions are not isolated from the whole body of Christian truth.
Theology is systematic.
All the definitions fit together. The distortion of one doctrinal definition begins a chain reaction. For example, if the truth of the doctrine of original sin is distorted the truth of salvation in Christ will also necessarily be distorted. A wrong view of justification will produce a wrong view of sanctification, etc. Of all the definitions that compose systematic Christian theology, the most important is the definition of salvation.