Your arms are too short to fight with God!

My arms are too short to box with God.
Not like I would ever want to get in a ring with God, so I don't really understand that saying. I mean, how would they bill that fight? "Isabella vs. The Creator of the Universe!!!"

Who would place their money on me? Even if my arms weren't too short, am I really going to hit God? I can hear my mom screaming from the sideline, "I'm so embarrassed! she hit God!"

A big booming voice would bellow down from the rafters: "ETERNAL DAMNATION!!"

"Your arms are too short to box with God" is downright stupid saying. Who came up with it, anyway? Why did my mom say that to me? Why didn't she stick with the basic? You know like "Don't lie, Don't steal".