Interface of the Reality
Belief systems are ways to understand, grasp, and interact with reality (regardless whether a formalised recognised one or the net beliefs of a person). One model of understanding of the workings of the body is that the body works via qi (ch'i), another model is centred on chakras, another one might even work with reference to the recognised anatomical features we all share. The different understandings might explain equally well or alternatively show great disparaties in deduced truth. Chakras and qi are unproven to even exist but at times can be useful in explaining phenomenon. One interesting point I heard that a qi blockage can cause poor circulation (cold hands), which western medicine treats as a natural disorder (something to be managed rather than solved). Apparently this is not true in Chinese medicine. I have poor circulation, hence my interest.
Economics and politics are the same in this way. The power of logic and authority might create an allegiance to one understanding of truth. I am rather straddled over the conservative/liberal divide because the explanations for both are both quite compelling and can explain different phenomena.
There is a taoist saying, "Once you've caught the fish, discard the net" which pretty much explains my thoughts on the topic. The fish (truth) always is paramount, the net (belief system / ideology) is the most dispensible. Yet as is often noticed people love their nets. The net offers consistency and stability. Thus it removes people a step from truth and reality.