What would you call my new beliefs?

[Nonpareil]

So, it seems you agree that space-time exists, but in socially constructed mathematical relationships. It doesn't seem like you are being inconsistent with the KCA then, just that space and time are dependent upon the first event and all of those arising afterwards.

Quite. Which is what makes this whole objection to the idea of dimensions so bizarre.

It doesn't actually help his argument any even if it is granted that time doesn't "really exist", whatever that means. It still comes down to bare assertion, and there is absolutely no reason to accept the argument as true.