An Argument for Eternalism
"(So it works exactly the same way for time as space: if an object has no identifiable spacial start point, it does not exist)."
I think if you move into higher dimensions like 4th, 5th and beyond you stop dealing with exact positions (10th dimension for example) and start dealing with existence itself as in all positions of an object exist at once.
I'm not sure why my previous reply to this was deleted because it wasn't the slighest bit adversarial towards you nor was it controversial.
When you talk about eternalism i would have to agree with that.