I don't know who you mean by far left, but I don't think it's largely anti-religious. We are supposed to be a secular nation(as told by Constitution, Treaty of Tripoli, etc). IMO, most of it is about equality and fairness. Take the money issue, for example: "In God We Trust". Who is "we"? What about those who don't trust in gods? Isn't that inherently exclusionary toward atheists?
Now, if by far left you mean Richard Dawkins and Sam Harris, then I agree with you.
Ah, public high school. Got ya. Sorry, it's late.