JOEL - Here are the verses in question:

"NOW the serpent was more subtil than any beast of the field which the LORD God had made.
And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
And the woman said unto the serpent, We may eat of the fruit of the trees of the garden:
But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die.
And the serpent said unto the woman, Ye shall not surely die:
For God doth know that in the day ye eat thereof, then your eyes shall be opened, and ye shall be as gods, knowing good and evil." (Genesis 3:1-5)

If you read it carefully, Satan did not say they would become gods but that they would be as gods, in that they would know good from evil. This was the truth.
The part that was a lie was telling them that they would not die.
A few verses later we read:

"And the LORD God said, Behold, the man is become as one of us, to know good and evil:" (verse 22)

God acknowledges the fact that Adam has become as one of them. So if Satan was lying about that, then God must have been lying too.

The whole point of that scripture is that Satan was trying to convince them that their eyes would be open to knowledge; not that they would become gods.
Critics commit the fallacy of guilt by association by wrongly using this scripture to demonstrate how evil the concept is that one can become as God by associating the idea with Satan.