I'm no atheist but I know what Joel's trying to say. Facts can be misleading because we are human and can't know everything. It comes to light that a 68 year old doctor was charged with statutory rape of a 16-year-old when he was 18: FACT.
Turns out the girl was his fiancee, they were married and have been happily married for 50 years with six children and 11 grandchildren.
Five people see a "hit-and-run." They each swear to tell the truth and then give five different make, model, and color of the car. What's the fact?
Joel is simply saying that Satan can thoroughly convince you with facts and seduce you away from the Love of God; and it's not that hard.
Crack makes you feel good: Fact
In the Middle Ages Christians waged war on the Islamic Saracens: Fact.
There is no physical proof of God: Fact
There is no proof for the miracles of the Bible: Fact
There's no law against premarital sex: Fact
There is no proof that prayer works: Fact
There are no miracles, only coincidences: Fact
If a woman dresses like a whore and behaves like a tramp in a bar full of men, she should expect to be treated as such: Fact
Everyone lies, including Christians: Fact
You can't legislate morality: Fact
There is no evidence of life after death: Fact