Three Engineers are Discussing God

So, three engineers are sitting around a table at lunch, discussing God.The first engineer says, "I think God must be a mechanical engineer." and proceeds to explain in depth how only a mechanical engineer could've built the muscle and skeletal system to work so beautifully together.The second engineer says "No, my guess is that he's an electrical engineer" and proceeds to describe how only an Electrical engineer could run an entire body off of such a small amount of power for such a complex system.The third engineer says "Nope, he must be a civil engineer!", prompting stunned silence from the other two."A Civil Engineer?!" Says one after a long pause, "What makes you say THAT?".The third engineer thinks for a minute and explains "well, only a civil engineer would run a waste pipe through a recreational area!"