No.Evolution has sects? Is that because it's a belief system too?
Yes, evolution is a belief system, too. Well...not a whole system by itself, but one that pertains specifically to biological phenomena. Some social scientists try to stretch it waaaaaaaaaaaaay beyond its parameters, though. So, in the sense that it is misused, it becomes akin to an ideology.
Evolution is the framework theory for all biological sciences. Biological sciences are one way of understanding biological phenomena - through the scientific paradigm, as it is envisioned in Western science (in Western nations). Because it rests on disproving hypotheses and not proving them, and often deals with non-directly observable phenomena, and because it is understood through the social (learning involves being taught, disseminating data involves all kinds of social conventions, etc), it is a cultural way of understanding biological phenomena.
There are other ways to understand such phenomena; other cultures do "biology" differently.