If Adam and Eve had never sinned, today's world wouldn't be the same as it was originally -- not at all. In fact, it would be radically different, because it would be exactly the way God meant for it to be.
It's hard for us to imagine what life must have been like before sin entered the world. But when God created Adam and Eve, He meant for them to live in a perfect world forever -- a world without death or sickness or conflict or evil of any kind. And that's the way the world was! Adam and Eve lived in a world of perfect peace and harmony -- harmony with nature, harmony with each other, and most of all harmony with God.
But when they rebelled against God, they didn't just fall away from Him. Sin -- like a deadly, savage cancer -- invaded the whole creation, and everything about our world changed. Death became the lot of the human race; evil gripped human society; even our hearts became hardened and rebellious toward God. The Bible says, "sin entered the world through one man, and death through sin, and in this way death came to all men, because all sinned" (Romans 5:12).
The most important truth I can tell you, however, is that sin has been conquered! By His death and resurrection Jesus Christ defeated death and hell and evil -- and some day His victory will be complete.
Yes, evil is real -- but so is heaven, and so is Christ. Is your faith and hope in Him?