Is our reality just a simulation?

People who were clinically deceased but came back can remember often seeing themselves in third person while they died. Their experience is often the same and they felt like this reality isn't real but afterlife is their real life. Bright light or unpleasant feeling in moment of death might be reaction to lack of oxygen in brain but rendering of entire life and seeing their bodies from outside isn't a sign decaying brain activity, since such functions need lot of metabolism. By the way I experienced seeing the entire life before death in moment I my ex was too fast in a curve and I flow at least 30m in air. Fortunately I have bones made of titanium and wore a leather suit that saved my life. Maybe is this rendering of entire life just some backup upload?

What if our reality is just an technically advanced MMO, a training or a preparation for existence in another reality? Our ego in another reality remembers our existences in this simulated reality but our current ego an player char doesn't have a clue? Doesn't it degrade belief in some omnipotent being to a BS?

Is our reality just a simulation?
Is our reality just a simulation?
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