Duncan, you ask an interesting question — what would one be without their beliefs.
It seems to me a random pile of facts has no meaning without a theory, a set of beliefs that one uses to arrange ‘facts’ into something with meaning.
So, to answer your question, without beliefs I would be lost, at sea without direction, without reason to exist.
I don’t see our place on earth as a reaction, rather we are a cause. Cause and effect are real, in my experience. The world we find ourselves in is an effect that demands an intelligent cause.
For me, the logic of Christianity is the best description of this world I find myself in.