I agree, one’s beliefs should be reflected in observed reality and they should be the basis for their actions.
But you literally just said that believers
don't consider what they'd expect to see if (their) god existed.
Why isn’t the believer’s definition of God consistent with the observed reality?
That depends on the believer. There are loads of different definitions of gods (I'd argue one for each and every theist who ever existed). Many people (including many other theists) find elements of those definitions inconsistent with observed reality.
For example, I personally don't think a being deemed to be omnipotent and omniscient can also have anything we'd recognise as needs or wants and could never be mistaken or change their mind.
There are also people who describe their god as having created the world 6000 years ago or flooded it 4000 years ago and plenty of people consider that as inconsistent with observed evidence.
Do you think that God existing would necessarily imply that God would communicate directly to everyone?
No. I think
some of the definitions of gods presented by some believers would carry the implication and so, given the lack of evidence for such consequence, that suggests
that specifically defined god doesn't exist.
Again, the key point is that gods are defined by theists, not atheists. Atheists assess all the different proposed gods they're aware of and, if no definition has convinced them, they remain atheist for the time being.
I am referring to religions that are associated with a God, since I define true religion as a revelation from God through a Messenger of God. Nobody can ever prove that a Messenger got a message from God or assess that scientifically.
That is really evading my question; What exactly is it about your specific type of religion that renders it specially immune to scientific study in a way that absolutely nothing else is (note that human inability to access or understand is not that same as something being beyond science).
I do not say “I know” in order to raise my beliefs above others,
I didn't say you were necessarily doing it consciously.
That is why this kind of discussion needs to move entirely away from faith, belief and religion to focus entirely on fact and reality, including recognising and accepting out limitations and weaknesses (like faith, belief and religion
).
However, I can understand why it is better to say “I believe” since nobody can know that God exists according to the commonly accepted definition of know. We cannot know that God exists through observation, inquiry, or information.
That is your belief. You've not even tried to establish that inability as truth.
Out of interest, do you believe this limitation only applies to the god you believe in or does it apply to all the other gods different people believe (or did believe) in, including all the ones that would directly contradict the existence of yours?