Lol. So in other words, you won't even try to show Scripture to support your conclusion.
I will quote right from The Lord:
"
19 There was a certain rich man, which was clothed in purple and fine linen, and fared sumptuously every day:
20 And there was a certain beggar named Lazarus, which was laid at his gate, full of sores,
21 And desiring to be fed with the crumbs which fell from the rich man's table: moreover the dogs came and licked his sores.
22 And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried;
23 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom." _Luke 16
Neither man "ceased to exist."
"And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:
10 And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?" - Revelation 6
The martyrs did not cease to exist. They are conscious, have feelings and can speak. And yet they were dead.
So again, you list verses but don't have scripture to support your conclusion. And there is scripture that says the opposite.
And the verses from Ecclesiastes were used out of context.
9:4 For to him that is joined to all the living there is hope: for a living dog is better than a dead lion.
The actual context of the first half of chapter 9 is that you can only be saved while alive. Once you die, that's it. You have no chance of salvation. When it says "dead know not any thing, neither have they any more a reward" it's talking about knowledge of salvation, not worldly knowledge and worldly rewards. This is not an explanation of what happens when you die. It is a warning that once you are dead there is no turning back the gates of Hell.
That's why it's better to be a dog that is alive than a mighty lion in the world who dies in sin. Because for all the lion's might, it aint going to Heaven. Where the lowly dog still has a chance as long as it has breath in its lungs. Thus the reason "there is hope."
It's really much more valuable to study scripture for its meaning and context rather than just to prove an argument. This is how we will all grow in The Lord. If you have another interpretation of the meaning and context of Ecclesiastes 9, please offer it. I'm glad to read it. But just throwing the scripture out with no explanation and saying "there!" is not edifying.