Calvinists are being urged to celebrate the 500th anniversary of their founders' birth by working for the unity of the church, promoting social justice and respect for creation, and by addressing war and violence.

The World Alliance of Reformed Churches has said that a South African church, suspended from the grouping in 1982, cannot be readmitted because it has not renounced the support for the apartheid ideology that led to its exclusion.

The World Alliance of Reformed Churches (WARC), which brings together 75 million Reformed Christians in 214 churches in 107 countries, has moved decisively to increase its global reach on economic and ecological justice issues.

Leaders of the world's biggest grouping of Reformed churches have compared the effects of neoliberal economic globalisation to the transatlantic slave trade, and said that Christians need to combat this modern form of "enslavement".

The general secretary of the World Alliance of Reformed Churches, the Rev Setri Nyomi, has joined events marking the centenary of the Presbyterian Church in Rwanda by urging it to speak out more boldly against injustice over the next 100 years.

The general secretary of the World Alliance of Reformed Churches has renewed calls for greater efforts at achieving equality and justice in global Christian mission relations, continuing a long-standing debate.