We can only perceive things depending on how we are thinking.
Consciousness is tricky in that we control it and what we allow it to observe.
Why must logic or reason coincide with reality or existence itself, if existence precedes human mind and reality flows from the human mind?
Reality is usually used to describe the objective existence of things external to us and our thoughts, so I would disagree that reality "flows from the human mind."
Perception certainly fulfills that function though (flowing from the mind).
Where does the consistency between logic and reason, and existence or reality arise from?
Why must our mind necessarily determine how things actually are?
It doesn't always; particularly when we're running on intuition alone. Reason and logic are what we use to attune ourselves as close to perceiving reality as possible. Example: you see what appears to be water in a desert; raw perception causes a false perception (mirage) but reason allows us to examine the states of affairs to understand that the heated sand can cause illusions that appear like water.
To say things must be logical or reasonable is to say that we decide how things must be. To think solely within the realms of logic or reason, is to think within boundaries that will never illuminate that which is, to us, unreasonable or illogical.
Reason is the only path to knowledge by definition of what "knowledge" is, which is justified true belief. Justification is the realm of reason, therefore all knowledge comes through reason. You seem to think that reason and faith are two different tools in a toolbox to find truth but no -- reason is the
entirety of the toolbox to discern truth.
If you can't justify it or understand it through reason then you don't know it; you just believe it unjustifiably -- which is the definition of irrational.
Again, if you don't value rationality you can indeed believe irrationally. You have no obligation to value reason. The problem only arises if you do indeed value reason but then abandon it by cherry-picking what you accept on justification or lack thereof: then you are self-defeating and inconsistent.
"Irrational" sounds like a dirty word but really it only describes whether you value being rational or not. If you don't, then by all means you can carry any unjustified beliefs you like.
Furthermore, must logic and reason conform to reality, or must reality conform to logic and reason? If the former, how can we say things must be logical or reasonable? If the latter, how can we say 'we' do not decide how reality appears? Or where does logic and reason appear beyond the human mind? To say that everything is or must be logical or reasonable is to say that the universe is wrought of mind.
Reason must conform to reality since reason is how we can think in consistently logical ways, where logic is an aspect of reality (the rules by which reality operates).
Reason doesn't appear beyond our minds because it's a methodology of thought: it's the act of checking beliefs or claims for internal (contradictory or not) and external (accordance to external evidence or not) consistency. Think of reason like the "science of thought."
Logic is indeed beyond our minds (except for the symbols and words we use to describe it) as it is the rules by which reality operates... for instance identity, which is the state of affairs where something is what it is and isn't what it isn't. Identity is responsible for the corrolaries noncontradiction (something can't be X and not-X at the same time and in the same respect) and excluded middle (something, if it is at all, is either what it is or something else).
Identity: A = A, something is what it is (oasis = oasis, mirage = mirage)
Excluded Middle: A or ¬A, either something is A or it's actually not-A (either there's water in the desert or not, regardless of what we're perceiving)
Noncontradiction: ¬(A & ¬A), something can't be itself and something mutually exclusive at the same time and in the same respect (it can't be both an actual oasis
and a mirage at the same time and in the same respect; it's
either an oasis
or a mirage)
