If an entity is omniscient, that means it knows everything — down to the movement of every subatomic particle throughout all history.
That entity must precede every physical thing.
Why?
The entity must be the source of everything.
Why?
The entity cannot have arrived at omniscience.
Why? If Omniscience is "knowing everything", then why can't God make someone who "knows everything"?
The entity had no option but to create exactly as it knew would happen.
This statement, I think, defines your use of "omniscience" and answers the "why" questions. "omniscient" is defined fairly simply--"knowing everything". "Everything" is defined as "all things". "Thing" is defined as:
1 : an object or entity not precisely designated or capable of being designated use this thing
2 a : an inanimate object distinguished from a living being
b : a separate and distinct individual quality, fact, idea, or usually entity
c : the concrete entity as distinguished from its appearances
d : a spatial entity
3 : individual not a living thing in sight
4 a : a matter of concern : affair many things to do
b things plural : state of affairs in general or within a specified or implied sphere things are improving
c : a particular state of affairs : situation look at this thing another way
d : event, circumstance Meeting her was a wonderful thing.
5 a things plural : possessions, effects pack your things
b : whatever may be possessed or owned or be the object of a right
c : an article of clothing not a thing to wear
d things plural : equipment or utensils especially for a particular purpose bring the tea things
6 a : deed, act, accomplishment do great things
b : a product of work or activity likes to build things
c : the aim of effort or activity the thing is to get well
7 a : something (such as an activity) that makes a strong appeal to the individual : forte, specialty
letting students do their own thing —Newsweek
I think travelling is very much a novelist's thing —Philip Larkin
b : a mild obsession or phobia
has a thing about driving; also : the object of such an obsession or phobia
8 a : detail, point checks every little thing
b : a material or substance of a specified kind avoid fatty things
9 a : idea, notion says the first thing he thinks of
b : a piece of news or information couldn't get a thing out of him
c : a spoken or written observation or point
10 : the proper or fashionable way of behaving, talking, or dressing —used with the
I don't see a lot of those that deal with unrealized future events. That doesn't mean they can't be included, but we don't use it that way, normally.
I propose that you are using "omniscience" to mean "settled future", and in that case, there's no contest--omniscience seems to mean fatalism. But I think the terms are differently defined.
An man living in this universe would be fated at every moment of his life.
I think so, based on
your definitions. But so is his understanding of the universe, meaning he is fated to think he's not fated, or he's fated to think he's fated.