Good and evil has always existed in the Universe, but I think there was a perfect balance between the two forces. God kept it out of Eden, but it was the Serpent aka Satan who allowed evil to be brought into the world through temptation.
The Crucifixion of Jesus Christ was to pay the ultimate price for sin...eternity in Hell. True, even the saved in this age still suffer pain and need to toil for food. But the saved in Christ never need to fear the Second Death (Hell). It is only with the return of Jesus Christ that we will fully experience the joys of His Kingdom as He intended. It is then that we will no longer suffer and die. We will not know sorrow or fear.