亞當、夏娃墮落前：

(1)。蛇是罪的化身，是否可以說亞當、夏娃墮落前罪已在世界上存在了？

Satan fell before man. See Isaiah 14:12-15; Ezekiel 28:12-19; Luke 10:18.

(2) 亞當、夏娃吃園中的果子，是否說死亡已在世界上存在了(果子被吃了，死了)？

Death is a part of our cosmic economy. Death is predestined and designed into our cosmos according to the Creator's foreknowledge and foresight.

(3)。如果亞當、夏娃不墮落，人類不斷繁衍，是否會把世界擠滿了？

See answer above. No such if, given God's transcendence and foreknowledge-based creation.