My previous post talked some about who Satan is. And I commented some on an excellent "He Lives" post on Satan.
How does Satan do what he does? Fortunately, he has a remarkably small bag of tricks. Unfortunately, we don't seem to be evolving very good defenses against them.
Satan's main attack is to question God's Word (for us, the Bible). This may be an outright contradiction, but is often more subtle.
In Genesis 3, we are given a close up view of one of Satan's most effective tacts (it worked on Eve).
Now in Genesis 2:17, God had said מות ת מות. That is, eat the forbidden fruit and "dying, you will die".
Now in Genesis 3, the serpent is trying to trick Eve. And Eve is not fleeing from sin (James 4:7, 2 Timothy 2:22, 1 Timothy 6:11). Here we see that pride comes before sin. Eve is showing off before the crafty serpent. She expands on God's Word, and says, ת מתון. That is, do not eat of it or touch it "lest you die".
Now we see how crafty Satan is. Look at a package of rat poison. It will say something like tetra-hexa-mega-death-o-caine 1%, inert 99%. That is, about one percent poison, ninety-nine percent food. How much poison does it take to kill you? How many lies make you a liar? How much deviation from God's Word brings death?
Satan gives back an interesting mix of what God actually said, and what Eve said: מותת מתון. That is, "dying, you will not surely die".
And that day, Adam and Eve died. And some 900 years later, their bodies died. And Satan told a half-truth. Neither Enoch nor Elijah died, but were taken directly to Heaven (they "did not surely die").
Beware of half-truths, and just a little Scripture. Look to all of God's Word. Flee from sin.