It can be shown that we are living in a block universe once we accept the special relativity. You might be interested to read this. — MoK

That'll be for another day. Not sure if I accept the block universe. Thanks for the link. Good read.

I see, so you are claiming space and time are substances—contrary to your original claim. Unless you are just noting that they are not separate substances when you said they are not substances. — Bob Ross

I can't call spacetime a substance because a substance is a separate property from all the other things in the universe. I just explained in my previous post that you cannot separate spacetime from existence.

Got it. By substance I was more thinking of just something that exists, an entity, in reality.