Their sex drives.
Think about it. The only social causes which can not be tolerated are those that ask us to control our sexual desires. G-d would not be a problem if He hadn't established a proper place for our sexual expression.
The gods who don't care, or even encourage sex, are just fine. Why do you think "The DaVinci Code" is so popular? Just because it attacks the Church? Of course not. It's because it makes Christ a pimp and all of our whoreish behavior not only acceptable, but spiritual.
Shalom.
So the question is, on what does their atheism rest?
Their sex drives.
Think about it. The only social causes which can not be tolerated are those that ask us to control our sexual desires. G-d would not be a problem if He hadn't established a proper place for our sexual expression.
That makes a certain amount of sense, though it doesn't explain why they are wasting their lives crusading for "economic justice" when they could be humping non-stop (pardon the vulgarism).