As slang yes ("Liverpool fans are religious fanatics"), as actual religion no.
Why? Because even if in the most extreme environmentalists you can find extreme zeal, blind adherence and maybe even fanatisicm, none of these are in and of themselves religious traits. They are merely traits we often attribute most strongly with the religious.
The most fundamental aspect of religion is always a belief in intent and purpose/meaning of the universe and/or soul.
In short the OP is little short of the traditional rhetorical trick; to discredit by proxy - You don't insult directly, you merely claim the targets of your derision to belong to a group/sect which your audience generally distrusts ("the political left are orthodox environmentalists","liberals belong to the political left", "republicans are rednecks","conservatives are warmongers").
By posing it as a question, you give yourself some leeway in that there is no actual claim made. Ofcourse, it isn't an actual question - but that is sort of the idea to begin with.
Stuff like this:
Quote:
Does the sort of orthodoxy environmentalism adhered to by many on the left
is also a twist of the same. By attaching a negatively connotated word (orthodox) to environmentalism, you give it an omnious tone. It is now something to be distrusted.
This also gives the impression that there is a "correct" environmentalism that the left does not adhere too, but ofcourse...this technique saves you the trouble of actually entering into an argument regarding differing views.
The usage of the word "many" is the traditional "hide in ambiguity". It really carrries almost the exact same meaning as "all", but you have plausible deniability if someone comes up and says "hey, not all are like this".
In short; As a rhetoric excercise...it is a C- because it is too obvious. As a political argument it is an F because it is merely an attempt to discredit without putting your own views to the test.
Thank you. Have a nice day.