"as though this were a church"
A "church" is where people go to get atoned for their sins; although many people commonly simply go to church to receive the Eucharist regularly, some people choose to go there at their worst times (Christians and non-Christians alike) in order to ask God for help or guidance. At church, they look for God during an encounter with adversity. By the photographer persona comparing the image subjects to churchgoers, he is conveying that they are in times of desperation and great need for help. It could also be to the extremity that they are looking for the photographer to tell them that everything will be okay (just as people want God to assure them that they will get through an adversity) as they cross to the other side (dying) because the photographer is the last thing/person that the attacked civilians see. Even when people do not go to church out of desperation, they commonly go to receive the Eucharist, which is salvation. Nonetheless, this salvation can also be viewed as the image subjects looking at the photographer as their hope. It could simply be that they are looking for someone to comfort them as they die, or they are hoping that their population/kind/family/friends will be saved because of the photographer's sacrificial work of exposing the truth with the risk of death. In conclusion, the victims are metaphorised as the churchgoers and the photographer is metaphorised as the salvation/hope/guidance that is found in church.