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Biological decline, at least, plus some diseases, poor nutrition, lack of a variety of activities to stimulate different parts of the brain. And genetics plays a part.

Oh yeah.
But death is always certain whether we like it or not it will come.
But only the physical aspect, the energy or spirit or soul is always there forever right?

I could not tell you the answer to that. If I have died (i.e. I'm reincarnated), I have no memory of it. If this is my first life, I haven't died yet, so I don't have that knowledge. ;)

I also have no concrete or full knowledge about these stuffs.
All I have is faith that there is something out there that is eternity. So, I gotta workout that faith to reach that.

Here's a question for you:

If I told you that I have faith that fairies, dragons and magic are real, what would you say?

Most people who are still grounded on Earth (i.e. not delusional) would say that I am crazy. Some, trying to reason with me, would ask me to provide proof so that they could say it's not real.

If I told you my faith led me to believe in Sasquatch/Big Foot, Yeti/Abominable Snowman, Nessy (Loch Ness Monster), and gremlins, you'd have a similar reaction.

If I stated that my faith proved that Santa Claus, the Tooth Fairy, the Easter Bunny and Jack Frost are real, would you react differently? Probably not, even if I showed you the myriad of books and other media that reference them, sometimes including lifelike photos and video.

If I argued day and night, year after year, I would probably be committed to a crazy house. My faith in these mythical creatures would be equated with insanity or perhaps addiction to certain drugs, and I would be treated accordingly.

One further example:

I tell you that my faith insists that ALL people are good. I teach that everyone can be reasoned with to employ their better nature. Given the presence of psychopaths, serial killers and people with other dangerous mental illnesses, is it realistic to believe this? I think not.

What does this tell us about the reliability and the fallibility of faith. As a measure of the probability of truth, how good is it?

When belief is what is required, in the absence of definitive proof, this is faith.

This begs the question: if all these creatures we may have been taught are real are not real, then what of the stories of a divine being?

This does not mean that I do NOT believe in the Creator, btw.

Fairies, dragons and magics might be real but not in this world I guess. Or if they're real in this world, I guess not all have experience them or see them. I guess there are unseen creatures /things/somethings we're aware and not aware of.

About divinities I guess they're real.
I believe that all the bad things, the horrific things are in the first place done by the demons or other evil spirits who influenced other people.

The question is:
How do we battle these evil forces?

If we can't see them or hear them, how do we know they exist? Because someone else said so? What if that person took LSD and then saw them, or consume peyote (magic mushroom) - does that mean that we have to use these drugs to see these creatures? Or, what if the person has a mental problem that makes them see these things? Does THAT mean they are real? Or, in either case, is it the result of a mental malfunction?

I have searched for supernatural creatures in both Indonesia and the US, going to places people said are haunted: houses, cemeteries and other places. One place, Lawang Sewu, in Purwokerto, Central Java, Indonesia, reportedly has a variety of supernatural creatures (over 35). I saw, heard and felt NOTHING. I have come to the conclusion that they do not exist. I possess several Indonesian keris, some of which are supposed to have been inhabited by supernatural creatures, but I've experienced nothing.

This phenomena, which is limited to being experienced by only certain people, is bound to be fallacious. This is not to say the people are lying, however, just that they are mistaken or hallucinating.

You believe in divinities? Which? I do not believe that the holy trinity is meant to be viewed as three distinct entities.

Keeping in mind our previous discussion about psychopathy, you now seem to be claiming that psychopathy is caused by malevolent creatures. I cannot agree with you LESS.

To answer your question: We do not. I do not believe they exist. Even if they do, it would require special abilities that we do not possess. I have seen TV shows purportedly showing human mystics fighting demons, but it was obvious that they were faking it - the attacks against them did not correspond with physics and were patently fake. If you believe in God, ask God for help.

I believe we have quite enough malevolent creatures on Earth that were created by humans - other humans, without imagining things that are not there. Sorry. Hell is on Earth, and Heaven, as we choose it. As you believe it to be, so it seems to become real.