The vast majority of truth (lower case "t") is totally obvious to everyone. If I was in your presence, I would push you (gently) and ask if you had any doubt about what I did. If it was raining, I'd suggest we stand outside and ask you how sure you were about that.
The problem with "Truth" (upper case "t") as in religious beliefs is that it generally has little correspondence to anything we personally experience. If I see someone die, then hang around long enough to watch the body decay and note that it doesn't exhibit any characteristics of life, I tend to conclude that death is final. If you tell me that the "Truth" is that an immortal spirit just left the body and is still alive in some other plane of existence, that won't seem obvious to me at all. At that point I'll ask you to demonstrate this "Truth", and I don't think that is unreasonable.
I was with you until the last sentence. I mean I agree with everything you said, that the "truth' is obvious to everyone, such as whether it is raining or not. However, "Truth" as we find in religious beliefs generally has little correspondence to anything we personally experience, so it is not that obvious to everyone. I think you are onto something here, but when you ask a believer to 'demonstrate Truth' that is illogical, since Truth is not demonstrable, since it is
not physical, such as the rain coming down outside the window. You cannot see religious Truth with your physical eyes, you can only recognize it with your mind (soul).
It is the "Truth" that an immortal spirit leaves the body and is still alive in some other plane of existence. Yes, the body decays, but some people have witnessed the soul leave the body at the deathbed of a loved one. They "see" something with their physical eyes and they try to describe what they saw to other people.
No wonder few people "find" this Truth. It's counter intuitive in most cases and requires a lot more than words to be convincing.
Unfortunately, all we have are words to explain things to other people. Some of us have experienced things personally but we still only have words to describe it to others and they don't usually believe us, since they have never experienced what we experienced. I never experienced anything paranormal myself, not until last year after the death of my late husband, but since I already believe in the paranormal it was not difficult to believe.
That's why I keep saying that God should give us more evidence. Without it the leap of faith required to believe becomes too great for many people.
God has given us evidence, through the Messengers that He sent. God is not a man who can "show up" on Earth and bring the evidence Himself. That is why God sends Messengers as Representatives.
Initially, a leap of faith is required to entertain the 'possibility' of an "unseen God," but after that, if we use our rational mind to reason, we can figure out that there is a God, using the evidence that was provided by the Messengers. Once that is accomplished, faith is no longer needed because at that point we
know there is a God, we not only believe.
That doesn't mean the stated "Truth" is necessarily false of course. Just requiring evidence, which brings us back to the subject of this thread.
What is evidence to one person is not evidence to another person, since all people are coming from different angles.
What people see evidence for and end up believing is influenced by combination of factors, such as childhood upbringing, education, and adult experiences. All of these are the reasons why we choose a belief or no belief at all.