Ethically speaking, should we respect “beliefs” and “belief systems”?

I am not suggesting that anyone should intentionally disrespect spiritual or religious individuals. In fact I try to aim to judge people on their actions and not on their creeds. Furthermore it is my view that there is more to an individual’s personhood than their spiritual / religious label.

But should we without question, automatically respect all beliefs? Especially when some of these beliefs could be used to put forward an agenda, and discriminate or oppress others?