Ramirez, remember, the statement was that religion has killed more people than any thing else. I looked up some quick stats on the inquisition and historians put their murder total at around 31,000 to 130,000, with a lot of the deaths ocurring from medieval prison conditions.
THe atheists of the various socialist movements racked up a murder rate of over 100 million people, around the globe, not just in Europe.
Also, the inquisition was in the way distant past when everyone was less civilized and people were violent and cruel as a common practice. Just watch any one of the cable shows, Rome, The tudors, and so on to get a taste of what it was like back then.(I know, they are television, but they show the cruelty of the times)
The communists, nazis and fascists, were just 70 years ago and they were modern nations, not medieval barely literate populations living in horrible conditions. The past religous persecutions do not compare with the modern socialist murders of the 20th century.