Some years ago I visited the St Tikhon's Institute in Moscow and saw how they were collecting in a database information about all those who had been killed because of their Christian faith during the Bolshevik period. The process is quite a lot further advanced than it was then, and the database has been used to add martyrs to the calendar of the church.
The article The blood of martyrs is the life-giving seed of Christianity! gives information about the progress of the project. So far 1596 new martyrs have been canonised, but there are many more whose details are being recorded. Professor Nikolai Evgenievich Emelianov gives details of the project:
the database of Saint Tikhon’s Theological University collects information about ALL sufferers for Christ, including the ones who are not proposed for canonization. In short, one can say that it is a database or repressions against the Russian Orthodox Church in the 20th century. A monograph with more than 4000 biographical entries has been published on the basis of the database. As of January 1st 2007, there are 29 000 biographies on the University website.One of the strange things I have noticed, in the light of this, is that I frequently see statements to the effect that "religion is the greatest cause of human suffering". If that were true, then one expect there to be far less of such suffering when the irreligious are in power. But instead, the record shows that when the irreligious are in power there is, if anything, more such suffering, and certainly not less. Atheists seem to be just as capable of cruelty as anyone else, and so the rather smug assertion that "religion is the greatest cause of human suffering" is not only untrue, but a dangerous delusion. I mention this because this delusion seems to be gaining ground in our day.
This is not to say that religious people are not also capable of great cruelty; events like the genocide in Rwanda show this clearly. But the notion that atheists are somehow exempt from this kind of behaviour needs to be shown to be false.