Ask ten average Christians in ten average churches to explain the doctrine of the Trinity, and you’ll probably get ten different explanations. Most Christians "accept" the Trinity as orthodox Christian doctrine. But they would be at a loss to explain why the doctrine matters, or how it affects their Christian lives.
As Catherine Mowry LaCugna explains in her introduction to God For Us, the Trinity is a doctrine that most people "consent to in theory but have little need for in the practice of Christian faith."1