Lyric discussion by MOnster48 

Cover art for Jimmy, He Whispers lyrics by Manchester Orchestra

I think it's about how it's hard for him to believe in God.

"God knows it's only time before i break the chain in my eyes" -Time will tell of what he really believes, God or reality.

"Fear keeps you hiding at night and the creatures play ball outside" -Fear keeps them from believing but there are these creatures that are outside that they see/hear (could be angels or other believers).

"Chances are slim we are right but i'd never think it any otherwise" -They might be right about God but he doesn't want to believe it.

"So we'll find the answers in time and the bodies pile up sky high" -They will figure it out but for now they will live life.

He hears the voice of God telling him that it's human to be fearful or doubtful but that he is there and that life after death is magical/wonderful. And the "lake" is heaven?

"We're the creatures that play outside" -They turn to God and become the creatures, too.

"And the thought that could kill comprehendable" -God or this thought of heaven/afterlife would kill any reasoning but he believes it because he heard the voice of God.

Just my take on it. May be completely wrong.

Love, MOnster.