The Greatest Day is a religion, founded by the Hosts.[1] People in this religion believe that the Hosts are here to help. It is based on The Hosts and The Arrival and attempts to merge all other religions into one.
History[]
After the Arrival a new religion was created and this religion appears to encourage people to believe that the Hosts are Gods. Lindsey is part of this religion.
Lindsey wears a lapel pin, that appears to be the same as the symbol for The Greatest Day, and Lindsey regularly attends church services along with other members of the Los Angeles Colony.
They also believe in "The Greatest Day" (which sounds similar to Alan Snyder's "Greatest Day In History") and believe that children will somehow have a big part to play in that day. The book Lindsey gave to Gracie Bowman details drawings of children being "lifted up" by The Hosts.
"Brother" Nolan Burgess and Madeline Kenner are prominent members of the religion. Madeline attended an indoctrination ceremony where she swore an oath to leading members of this new religion, and then was able to grasp a "holy relic" of sorts, which was a piece of alien technology that granted her a vision, which she seemed to find to be both exciting and disturbing.
Later Madeline ask Alan Snyder is The Greatest Day true and Snyder disclose that it is just a hoax to manipulate people.