Nine people were killed in two attacks on Coptic Christians in Cairo on 29 December. Seven died as a gunman tried to storm the Saint Mina Coptic church.
“I write with great sadness over the attacks and loss of life of our brothers and sisters in Christ as you prepare to celebrate Christmas in the Orthodox calendar,” said Mr McMillan.
“I write so that you and those who grieve know the prayers and love of our Church for your community. We are the body of Christ and we grieve with you at this time.”
“The embodiment of the Trinity of Love in the Christ child, which we give thanks to God for, reminds us all that Jesus was the Prince of Peace.
“We pray for peace for our world, and particularly for the Middle East and we pray that the hope born on Christmas morn would be new for all our Coptic friends as you come together this Christmas.”
Mr McMillan also conveyed prayers and condolences over the attacks to the Coptic Orthodox Bishops in Australia, Bishops Daniel and Suriel to assure them of the love and prayers of the people of God in the Uniting Church in Australia.
More than 100 Christians have been killed in Egypt in the past year, with most attacks claimed by the Egyptian branch of the terrorist group Islamic State.