I frame this joke by explaining that it was told to me by a former Jesuit priest.
Three engineers are sitting around discussing the nature of God and while they agree that based on the magnificent design of the human body God must be an engineer they can’t agree on what kind of engineer.
“It’s obvious,” says the first engineer, “that God is a mechanical engineer.”
“How to you figure?” asks the second engineer.
“Just look at the skeleton, the way the joints work and the structure of the body. Clearly, a mechanical engineering marvel.”
The second engineer says, “I think you’re wrong. It’s obvious to me that God is an electrical engineer.”
“By what logic?” the first engineer asks.
“Look at the nervous system. All the impulses that have to be transferred around the body nearly instantaneously back to the brain are vital to the body’s functioning. This is obviously the work of a master electrical engineer.”
The third engineer, who has been quiet up until now, laughs loudly drawing stern looks from the other two engineers.
“You’re both wrong,” says the third engineer. “God is obviously a civil engineer.”
The other two engineers’ mouths fall open. Finally one says, “By what reasoning could you possibly determine that God is a civil engineer?”
The third engineer smiles and says, “God is obviously a civil engineer. Who else besides a civil engineer would put a waste disposal plant right in the middle of a recreation area?”