I can’t help rejecting creation out of nothing (ex nihilo), and I’m pretty sure I’m in good company in the scientific community.
BBT features GRT and the Cosmological Principle (CP). I have no problem with a universe that is homogeneous and isotropic on a large scale, so I don’t think the CP part of BBT enters into the question about origin.
Realizing that GTR breaks down in the Planck Regime when it is tracked backward towards its limit, one must conclude that if there is going to be a cosmology that actually addresses a scenario that doesn’t require an “ex nihilo” beginning to our expanding universe, it will have two characteristics.
It will include a theory of gravity that works in both the Planck Regime and at the atomic particle level.
It will predict a fundamental unifying particle that unifies gravity with the Standard Model of Fundamental Particles.
Does it follow that such a particle itself would be the cause of gravity, or would explain the physics of gravity in terms of force instead of curved space-time?