Don't eat that apple

What would life be like if Adam and Eve had not sinned?

Left to ourselves in the freedom to choose to to sin or to do good, we would sin every time. If this were not true than all of mankind would not have been dammed for Adam and Eve's sin.

If God had created a world in which we did not have the ability to freely choose to do good or evil than there would technically be no "moral good," but only good that God had programmed us to do.

For God to create a world where there was any existance of "moral good" we would have to be given free will to do so. However, in giving us free will, we also have the free will to do "moral evil," which we will always choose to do, otherwise we would be equal to Christ in perfection.

If we are still assuming a reality where God is God and Christ would be the only human to ever be sinless than Adam and Eve would have had to have sinned. If they had not sinned than Earth would truly be heaven on Earth, or a new heaven and new earth (Rev. 21:1).