You need to assume that consciousness is true.
Cogito ergo sum is a datum, not an assumption.
Then you speculate that this consciousness came from inert material by some process.
From the evolution of the nervous system, to be precise.
If that is true, then there can be no reason as to why your intellect and your data are objective.
Subjectivity is a fact of reality. We look out at the world and make of it what our senses, culture and education let us make of it. When we realize the importance of objectivity for making accurate statements about external reality then reasoned enquiry, of which scientific method is part, is easily the sharpest tool in the shed.
If you ponder a bit you may discern that you are you are imposing an imagined history on top of he consciousness evident in 'Now'.
Do you mean a remembered history? One that can be verified to a substantial degree from contemporary records still extant?
If you don't, then what imagined history are you alleging?
Materialists are self deluded, in self harmful ways.
A pity you don't set out examples and demonstrate their correctness, then.
OTOH, we do not at all doubt that consciousness at the root of intellect enables it to discern truths objectively -- once the imagined stories are stripped away.
If you read modern brain research, you're know that almost all brain activity is non-conscious.
We understand that the true nature cannot take birth or die.
Are you referring to the conservation-of-energy rule in physics? If not, what test will tell us if something is 'true nature' or not?
God remains gold whether you make a bangle or a chain out of it, or if you beat it flat.
Gods are imaginary. There isn't even a definition useful to reasoned enquiry of a real god, a god with objective existence. If you can provide me with one, I'll be delighted, of course. After that it will only be a question of your providing a satisfactory demonstration of such a god.
One has actually no way to ascertain objective existence of anything, since no object can be proven to exist external to mind-senses.
I assume that a world exists external to the self, and I assume that the senses are capable of informing us about this world, and I assume reason is a valid tool.
And you're shouting over yourself here, because by posting on RF you demonstrate that you share those assumptions, or at the least the first two.
So your complaint appears incoherent.
You answer 'Evolution'. That answer is blind. Why should a rock or a molecule or any combination of inert unconscious material develop taste?
Because it's become biochemistry, moved into the category 'life', evolves according to natural selection, by which lifeforms less able to survive and breed in their environment for the time being pass their genes into the next generation on fewer occasions than their fellows who are better at surviving and breeding. And the ability to sample in advance the suitability of potential food leads to the spread of the first taste bud ─ a biological reactor to particular chemical stimuli. And these send a nerve signal to the brain which the brain registers. And that registration takes the form of our sense of taste, our awareness of the reaction.
OTOH, we hold that consciousness and all its mental-sensual faculties are unborn and are true.
If only you had evidence for that, perhaps you could persuade people that you're right.
The manifestations take birth or are absorbed --- like when we go from dream to deep sleep state.
What does that mean? What evidence supports it?
Sense of self is instinctive in humans, animals, and plants.
Not sure about plants.
We surely consider the instinctive actions beyond intellect but within consciousness.
No, we consider instinctive actions to be independent of intellect and consciousness. You don't need conscious thought to act instinctively. You don't stare at the flying object, say, Ah, that's a ball; I'll raise my hand and catch it. Instead you just catch it.