Trinity Church is one of the three founding churches of the Communion of Reformed Evangelical Churches. This is from the CREC website:

The Communion of Reformed Evangelical Churches is a growing body of congregations spanning much of the world, including the United States, Canada, Japan, Russia, Ukraine, Bulgaria, Central Europe and Southern Asia.

The churches of the CREC uphold and embrace the historic Christian Creeds.

Each congregation also affirms the evangelical tenets of Protestantism, holding to one or more confessional documents of the Reformation.

Read more about the CREC here.