Deadliest religion ever?

[Brian37]

The deadliest religion ever is the one that includes deity worship.

Um no, China has had parts of its history which were lead by very superstitious religious and very brutal leaders, not under modern communism, but in antiquity. The Terracotta Warriors of antiquity were trained to be blind loyalists to their ruler, and within their ranks it was very Orwellian and dissent was met with brutality, on top of the age of their conquests. 

Even the dictators of modern Asia like Mao and Po Pot ruled over majority religions. North Korea also has it's own brand of religion. Deity worship isn't required for a religion to become brutal. You have to read and compare religion not just now, but everywhere in time throughout our species history to see this.

I can pull up even modern stories of Buddhists persecuting Muslims. 

https://en.wikipedia.org/wiki/Persecutio...in_Myanmar

There are only more active volcanos and more dormant volcanos over centuries, but power shifts over time and a less dormant volcano can become more active over time. No group of humans is immune to future barbarity if the conditions lead to that. It is only by understanding a global history of the past we can reduce the risk of repeating that barbarity in the future.