The people in the video are explaining what they went through when they were at church and got attacked by terrorists. They describe what the terrorists are willing to do in order to try to get the people who don't have the same beliefs as them out of their country. The terrorists were willing to kill anyone and destroy anything and not have any remorse of their actions.
The girl tells her experience of what she went through because she believed in a certain religion. Over time, religious persecution hasn't gotten any better. It's almost as bad as the holocaust because other people who may believe in one religion are targeting people who believe in another religion. This problem, religious persecution, is occurring all over the world.
You will learn that religious persecution still haunts them years after it happens. They will never forget the memories they have from being held in concentration camps. But most of all, they will also never forget the day they were saved from the people keeping the hostage, which can be a good thing but could bring back sad memories.