Can you guess what religion Dennis Prager says has been the most influential over the last century? (It's not what you think)

In a recent article, syndicated radio host and author most recently of "Still the Best Hope: Why the World Needs American Values to Triumph," Dennis Prager made a profound assertion:

"...the most dynamic and influential religion of the past hundred years has not been Christianity, let alone Judaism, the two religions that created the Western world. Nor has it been Islam. It has been Leftism."

Thousands of protestors gather at the National Mall in Washington calling on President Barack Obama to reject the Keystone XL oil pipeline from Canada, as well as act to limit carbon pollution from power plants and move beyond coal and natural gas, Sunday, Feb. 17, 2013. (Photo: AP)

Writing of the march of Leftism through the institutions from literature to academia to the media and ultimately to our politics, Prager asserted that environmentalism specifically is now the religion of our time, having surpassed feminism as the most animating of all beliefs among Leftists.

Prager argues:

"For the left, the earth has supplanted patriotism...instead of allegiance to the nation’s flag, now our allegiance must be to nature. This is the antithesis of the Judeo-Christian view of the world that has dominated Western civilization for all of the West’s history. The Judeo-Christian worldview is that man is at the center of the universe; nature was therefore created for man. Nature has no intrinsic worth other than man’s appreciation and (moral) use of it...Worship of nature was the pagan worldview...With the demise of the biblical religions that have provided the American people with their core values since their country’s inception, we are reverting to the pagan worldview. Trees and animals are venerated, while man is simply one more animal in the ecosystem — and largely a hindrance, not an asset."

Citing various instances of environmentalist initiatives from opposition to the Keystone Pipeline, to support of animals against being put to death for mauling children (see the efforts of the Lexus Project), all the way back to the outlawing of the use of DDT, as echoed in a recent submission by a founder of the green movement James Lovelock ("It’s become a religion, and religions don’t worry too much about facts"), Prager continued:

"This is the trend. Nature over man...As G.K. Chesterton prophesied over a hundred years ago: “When people stop believing in God, they don’t believe in nothing — they believe in anything.” Now it’s the environment."