Marvin, who is fleeing from Christian missionaries who have taken over his village and are rather unkindly assuring them that their faith in Christianity will get them food, which obviously won't happen, goes into the ship in search of a place to relocate his people.
Marvin goes into the ship in search of a place to relocate his people. Their faith in Christianity will get them food, which obviously won't happen. Marvin is fleeing from Christian missionaries. These Christian missionaries have taken over his village. Marvin are rather unkindly assuring them this.