The only alternative to “belief” is believing ONLY what you see and can prove and no more. No one can really do that, and in any event, doing that leaves a lot of imagination and conjecture behind.
For example, belief in a non-physical soul. All you can really prove about human life is that a person is gestated, born, alive for a while, and dead – the component parts eventually getting disbursed. And that could very well be reality. So, we have materialist types who believe that consciousness is the product of physical processes and laws, located completely within the skull.
But there are indications that that is not true – that consciousness is external to the physical form. There is no real proof, but there are indications.
So – what are we to do? Ignore the indications? Ignore the logic that supports a human soul as opposed to a mechanical meat automaton? Choose to only believe was can be proved? Even Scientists do not do that.
Everyone believes in something, and not all beliefs or opinions are supported by undeniable evidence. They are, however, usually supported by core assumptions. Assumptions that may or may not be true, but if they are true, lead to a string of deductions that can lead anywhere.
My personal core assumption is that we are, each of us, spiritual in nature, and not composed of matter sprung from the Big Bang. I could very well be wrong. But if I am wrong, then we humans are nothing more than rocks floating in space that happened to combine a certain way, and which have no meaning at all, with no “free will” (since rocks have no will), and no “creativity” (since all that is or was was predetermined by the Big Bang).
This may be right, but it is way, way too bleak for me to accept as truth. And in any event, I have experiences and indications that tell me that it is not the truth.
Call me a “believer”, but be assured that I have come to my beliefs with a lot of thought and reasoning, knowing that I could very well be wrong.