Christians in India marched outside the Pakistani High Commission in New Delhi, protesting two suicide bombings at a church in Peshawar, Pakistan.
On Monday, Christians denounced the deadliest attack ever against members of their faith community.
The attack on Sunday happened as worshippers were leaving a service at the historic All Saints Church to get a free meal offered on the front lawn.
Eighty-five people were killed and more than 140 were wounded.
A wing of the Pakistani Taliban quickly claimed responsibility for the bombings.
In India, more than 100 marchers sang hymns and shouted slogans Tuesday, demanding protection for Christians in Pakistan. They also submitted a letter condemning the attack to Pakistan's Deputy High Commissioner in New Delhi.
John Dayal, Secretary General of the All India Christian Council, said the letter "conveys our anger, our shock, our fears, for what has happened to our brothers and sisters and our children in Pakistan."