Is the Big Bang Just an Event in an Existing Space/Time Fabric?

[Physics_Kid]

another philosphical Q. i make notion that from what we have learned over the life of humans, is that we don't know too much, and for some things we were just wrong.

i ponder this Q, why do we write The Big Bang at time=0 as a very small point that contains all the mass of the universe. can't it just be an "event" in an existing space/time fabric, as example, perhaps two super-duper-massive black holes eating each other and the result was the release of observable mass/energy? basically an energy converting process that converts lots of dark energy into non-dark energy ??

 

[Orodruin]

as a very small point that contains all the mass of the universe

We don't.

cant it just be an "event" in an existing space/time fabric, as example, perhaps two super-duper-massive black holes eating each other and the result was the release of observable mass/energy? basically an energy converting process that converts lots of dark energy into non-dark energy ??

This would violate observations of how the Universe behaves and has been behaving. You are basically just presenting buzzwords here. This is not how physics (or any science) is done.