亚当、夏娃堕落前：

(1)。蛇是罪的化身，是否可以说亚当、夏娃堕落前罪已在世界上存在了？

三木森答案：NO。圣经中罪的定义是远离神。在亚当夏娃堕落前，虽然撒旦犯罪，但是在灵界。尽管神允许撒旦进入蛇体内(为了试验人) ，但撒旦还不能对我们的这个世界起作用。因为蛇为动物，没有自由意志，不会犯罪。罗马书明说，罪是由一人进入世界的。所以，始祖堕落前，我们的世界没有罪。

You did not take the entire biblical revelation into consideration. You also unduly restricted the meaning of world to mean the earthly world, without first clarifying as such in the question. The word world in the bible can mean more that this. Sin, pre-existing due to angelic rebellion against God before the creation of mankind, entered (by Satan) into our earthly world from the world above (the heavenly realm or heavenS), part of the larger world we live in.

(2) 亚当、夏娃吃园中的果子，是否说死亡已在世界上存在了(果子被吃了，死了)？

三木森答案：NO。圣经中说的死亡，是由罪引起的，受上帝的咒诅而会自然死亡，不能永生。或生物界的自相残杀。意思是“死做了王” 。在始祖堕落前，地里的出产，是神命定供人享用的，不会自然死亡，除非人享用了它们，只是一个设计的代谢循环的环节。只有当始祖堕落后，大地(或大自然) 也受到咒诅，地才不为人效力了，才长出荆棘等，自然界才有了自然的死亡，凋零。也才有了互相残杀。“死才做了王” ，没有永生了。

Without declaring your presumption about the genesis creation models, you already assumed that there was no biological death of any sort before Adam's fall. Death in the bible has two-fold meanings: physical and spiritual. Can physical death be designed, a priori, into the present cosmos due to fall (spiritual death) of mankind posteriori? Nothing really stops the Creator from doing so. You actually admit this concept in the following answer.

(3)。如果亚当、夏娃不堕落，人类不断繁衍，是否会把世界挤满了？

三木森答案：NO。上帝预见到了人类会堕落，才有目前的世界。如果人不堕落，上帝也会预见到，那么世界可能就是另一个。并且，神说要生养众多，布满大地。那么布满大地后，或许生育就停止了。反正，他有办法。

Good, you admit that God created this type of world based on his foreknowledge of the fall of man. The physics of this cosmos would be very different, had man chosen to obey God. The new heaven and new earth is one such a wonder world.