(Shit, I never saw this! <3)
Enjolras did believe in those things, yes. And being sick was no reason not to be intense. Well, for him at least. Of course, it was entirely possible that the high fever was contribution to the burst of intensity that seemed to be...a little further out there than usual. But yes, generally his beliefs were pretty much one of those things that were ingrained no matter what.
The word faith itself wasn't so much the problem, if you found something that you really, really could put it in. Enjolras didn't tend to have it, religiously speaking, and what faith he had, he had placed in all the others, but having his friends share it wasn't too terrible, was it, if it was for something in the direction of their goals?
"A little more criticism..." Enjolras frowned, but it was thoughtful, there, "And I suppose a look at modern society and whether or not a Social Contract is even a valid idea now." It seemed to be a good source for getting started but, "You're right about the approach I think. I've scratched the surface but need to go further before I run around in the streets screaming these things." As if he'd ever scream them though.
"I feel all right, I think." He tried to tell Grantaire, ruining it as he had to stop again, this time for a longer pause while he willed himself to catch his breath and not to start coughing again. "Aside from this. I...it's all been on my mind. I can't let go, I think."