Jesus is coming back with an army of His
saints. The church is where these saints
come from.

1 Corinthians 15:51-52
"Behold, I shew you a mystery; We shall
not all sleep, but we shall all be changed,
In a moment, in the twinkling of an eye,
at the last trump: for the trumpet shall
sound, and the dead shall be raised
incorruptible, and we shall be changed."