Did God create sin?

If God created everything, did He create sin, and if so, why does He punish us for sinning?

God didn't create sin any more than parents created tooth decay. They know it is an inevitable consequence of life, and train their children to avoid it; brushing, flossing, etc.

Likewise, God knew that having the power of free will without the guidance of His wisdom would lead to the inevitable consequence of selfish, sinful living.