Belief by its very definition both does not require proof, and emphatically denies the need for proof.
Proof and faith are mutually incompatible.
And as far as the scientific process:
Yes, we do not understand everything. Yes, many conclusions are based on only the evidence we currently possess.
The critical difference is that while our knowledge is inadequate to explain everything, we in the rational field are constantly adjusting our theories and hypothesis to adjust for new data. The work is never done, and there is always more data to add into the equation.
Religion, and belief, on the other hand claim to HAVE the answers. There is no need to investigate, no need to ask uncomfortable questions, because God wrote everything you need to know down in his book a few thousand years ago. There are already the answers, and you might as well shut off your mind.
A major issue I have with the major religions in the world is that every single one claims they're the one true way to God. You can't all be right. Give me a reason that you're right, and the Muslims aren't. A reason they couldn't just turn around on you.
Because they believe you're going to Hell just as much as you believe they're going to Hell. And that leads me to believe there is no God, and no Hell.