I looked it up now;
"
The use of a controlled study is the most effective way of establishing causality between variables. In a controlled study, the sample or population is split in two, with both groups being comparable in almost every way. The two groups then receive different treatments, and the outcomes of each group are assessed."
Source:
Statistical Language - Correlation and Causation.
So you are correct that I didn't do that, because it would be unethical, but I still think there is no room for reasonable denial that indoctrinating a people with the view that God wants them to kill those who convert away will result in murder.
That it is a causal factor is simply obvious.
In my opinion.