I have introduced the good news to an unbeliever the other day. He asked me such a question: Since God knows everything in the past, at present as well as in the future, he must also completely know what will happen in Eden in advance, that is, Adam and Eve were destined to eat the fruit from the tree of knowledge of good and evil when the serpent came to lure them. God has already known that they can not endure the test and eat the fruit, therefore sins entered the world, men will have to accept the Salvation of Cross which also was arranged by God in advance. In the whole process, we human being are totally passive, it was not 2 ways displayed before Adam and Eve, eat or do not eat, but only one way, that is, eat! Otherwise there will not be the subsequent story. From this point of view, the redemption of our Savior is not so precious as we think all along, since the disobedience of our ancestor is also part of God's eternal plan, there is no other choice for us human being, we are just miserable puppet under God's hand.
Frankly, I also don't know what the answer of this question is. Some people think before the world was created, there was a battle between God and the Satan. While God did not defeat Satan directly, for Satan is far from the rival of God, God will not be glorified by doing such, just like a giant defeated a little child. Therefore God created human being, who were lower than Satan, and through the victory of the second Adam (Jesus Christ in human flesh, who also was a man) and his follower, God declared the failure of Satan-----he can not even defeat the beings lower than him, not to mention God, who is the king of kings, and LORD of lords.
Maybe we can not understand the actual truth until the day we meet our God face to face. We are just the creation of our Lord. How can we ask our creator why he created us like this? But I still want to present this question here, and I wish to see some light from you. I am a new believer after all. May be it will help me love our Lord more deeply by knowing him more. Thanks!