Keith, you have provided a handful of very selective anecdotal examples and expect that to serve as proof of something. I'm sorry to have to inform you that such "evidence" does not prove anything at all.

And you said that 4 percent said they believe it would be ok to kill to protect or preserve their religion. You did not say they said they believe it would be ok to kill if their religion was insulted. The article about the study does not provide a figure for the percentage of students at UK universities who believe it is acceptable to kill if their religion is being insulted.

There have been cases in which Christians and also members of other religions have killed and/or threatened to kill people for insulting their religion. I expect that a survey of how many people of other religions believe that it is ok to kill for their religion has never been taken. So you can't use the absence of such a survey as proof that there wouldn't be similar numbers if one were to be taken.

As I said before, your assertion is pure speculation. In the absence of any hard figures it will never be anything but speculation.