Johnny Smith (played by Christopher Walken): The World and it's reaction to the virus as dictated by medical professionals and government leaders
Greg Stillson (played by Martin Sheen): the Church leadership and its message that to live is Christ, to die is gain
The baby: the deposit of Faith once for all delivered to the saints
The photographer: the world, especially the younger generations, who are watching
With that summary of the primary cast members in the scene, roll'em:
A cheap shot on my part? Perhaps. But you decide. What is the Church banning Christians from Church with nothing but a here and now focused worst case scenario put forward by doctors and government officials look like to young people already immersed in a secular, materialist, atheistic age? I suggest it doesn't look much different.