Do Protestants believe that had Eve not sinned the Fall of Creation would happen when the next human sinned?

### Background Protestants who believe that the sin of Adam/Eve caused a fall in creation appear to believe some variation of the following : > The fall of man was caused by Adam’s sin. Sin is any human behavior, word, or thought that is contrary to the perfection of God. Because of Adam’s sin, God placed a curse upon the world, the people, the animals, the plants, and the very ground (Genesis 3:14–19). The idea of sin "entering the world" via Adam and Eve is also found in the NT: > Therefore, just as sin entered the world through one man, and death through sin, and in this way death came to all people, because all sinned - Romans 5:12 ### Question If the sin of Adam and Eve caused the Fall of Creation and sin to enter the world, one could imagine had they not sinned the eternal fate of all humanity would hover on a knifes edge until someone else sinned. Do Christians believe there was something unique about Adam and Eve and their sin where they (and only they) could cause the fall?