Left 4 Dead Easter Egg - Resident Evil: Apocalypse "Church Man"

In Death Toll, mission 3 (the church), you come across a safe room being occupied by a paranoid survivor. The survivor threatens you and yells that it "is his church". This is a reference to Resident Evil: Apocalypse where Jill Valentine and her RPD partner use the church as a hiding place, but find it is occupied by a scared and paranoid survivor. Both survivors shout "This is my church! I was here first!".