Adam and Eve haven't really done anything to show that they are that strong, true, but my main reason is that God just didn't want them to become immortal like him.
22And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever: 23Therefore the LORD God sent him forth from the garden of Eden, to till the ground from whence he was taken.
Now, I could have it backwards in that the Tree of Life would have given them that power.
Lazarus - 1,000 (all he did was die and get resurrected by Christ)
Methusehla - ? (I know nothing about him except that he was the oldest, which means nothing)
Solomon - 10,000 (his wisdom doesn't equate to a high power...which actually goes against the Adam and Eve thing :|)
Nimrod - 100,000
Simiramis - 50,000
Judas - 500
Job - 10
The Beast - 750,000,000,000
The False Prophet - 100,000
The Whore of Babylon (for some reason, I thought Mary) - Unknown. Either she is powerful enough to control the beast, or the beast is loyal to her.
White Horse (Anti-Christ) - 250,000,000
Red Horse - 50,000,000,000
Black Horse - 250,000,000,000
Pale Horse - 500,000,000,000
Adam & Eve (corrected) - 2,000
EDIT: That damn copy and paste screwed everything up.