One could argue that belief actually increases the ability of an individual. Belief can limit nothing. Well, yes, believing in an absolute is the limitation, as you have said. That is all. Although it is abstract to compare this with any belief system, it is the same thing.
Sure belief is existence.
So, you see, there IS an absolute. An expression of existence cannot possibly be limiting. That is all. You say not zero, but everything equals infinity. Well, yes, you are right.