P.L.A.N.E.

Listen up, smarty-pants (that's sarcasm, BTW, because you need me, Explain Bear, to break this down). The joke is playing on the acronym P.L.A.N.E, and making a reference to the gospel song "Precious Lord, Take My Hand" which is commonly sung at funerals. The punchline suggests a dark twist by asking if nonbelievers are evil which might make them deserving of death. You probably think that is funny because you have a small brain.