It's just a saying.
Valhalla is a place warriors go.
Patel is calling Kirk a warrior.
He's calling himself one too.
Kind of insulting to your own religion or Christians to refer to something in Asatru. It literally goes against one of the 10 commandments in Christianity.
"You shall have no other gods"
Because in essence he wishes him to go see the afterlife of the norse gods in Valhall, you know Thor, Odin, Loke, Freya nd whatever 150 other norse gods.
What happened to the gates of heaven and the all mighty Jesus Christ
