The Church is called

In June 1977 the Uniting Church in Australia issued a "Statement to the Nation". It spoke of the responsibilities and identity of the UCA and how it saw the life of the UCA in Australian society.
Statements and press releases on social issues continue to quote this statement to the Nation, even thirty years later (p616 Theology for Pilgrims)
The UCA very much sees itself as being part of society, standing for justice, caring for God's creation, enabling unity while challenging the values of the world and being a prophetic voice that acts and serves in the love of Christ.

The basis of Union then goes on to explain more fully the call that God has for the life of the church.

As the title suggests, the Basis of Union was written as a basis for the union of churches that we know today as the Uniting Church in Australia. The denominations that form the UCA were the Presbyterian Church, Methodist Church and the Congregational Church and they united in 1977. One of the strengths of the Uniting Church is its willingness to have open conversations with Churches of other denominations and faiths and its desire to continue Uniting with Church partners in Australia and around the world. One way in which the UCA shows its interest in partnering with other cultures is by having the Basis of Union translated into other languages, such as Korean, Fijian, Tongan, Samoan and Indonesian. The UCA is becoming a multicultural denomination as it seeks to reflect in congregations, the people in the surrounding communities. It is also in covenant with the Uniting Aboriginal and Torres Straight Islander community as a process of reconciliation between the first and second peoples of Australia. Through this partnership the church has been opened to understand God as already being here before the second peoples arrived and to see God from the faith perspective of the first peoples. This opens our understanding of God and encourages conversation and reconciliation between these communities. In terms of “call” the UCA feels called to multicultural mission and partnerships and continues to seek God already present in those communities.

As you read the Basis of Union you will see signs of both reformation and evangelical traditions that still form the UCA today. It is still important that Ministers and Deacons of the word have sound biblical knowledge and a solid academic foundation. Preaching the word of God is still valued in the church as a means of God being present when preached amongst the people. However it is also equally as important for people to authentically live out their faith in a way that shows people a living gospel.