He is obviously referring to the comparison of radical environmentalism to religious fervor. This analogy is very common in conservative circles, mostly because the analogy is so correct.
As a liberal, this kneejerk wouldn't get the reference, but I would imagine so much goes over his head unnoticed each day.
For an explanation of the comparison, he should pray to Gaia for karmic enlightenment, or seek a chakra releasing audience with Pope Gore.
As I said in a similar thread:
I agree with Santorum. When I heard Obama’s National Prayer Breakfast speech, I wondered “Where did he learn that intrepretation of the Gospels of Jesus?” It was a near social justice and secular humanist versions of what Jesus said. He spoke of Jesus as a radical social reformer, seeking to change the power structure in ancient Israel. That he was focused purely on physical things of this world and not spiritual things of the next world.
Obama does not, in those words, shows that he understands or knows that Jesus came to save our souls and take us (our true selves, our souls, not these physical bodies) back to heaven to be with our Father.
The gospel that Obama learned is that of humanism and communism that he learned from his grandparents, Frank Davis, and “the reverend” Jeremiah Wright.