Actually, you have it backwards in spite of what Hawkings has said about God the BBT posits a beginning just like Genesis is a beginning. It says nothing about who or why. Anyway, that’s not science’s job to answer those things. It replaced the Steady State Theory (SST) which doesn’t require a ‘creation’. Which makes it much more an ‘atheist’ theory. It’s infinite in both negative time and positive time. SST does posit a lot of little ‘creations’, matter popping out of ‘nothing’ - the quantum fluctuations to replace matter burned up by stars.
Anyway, theories are proposed, they work for a while maybe a long while then new data comes modifies the theory or eventually completely subsumes into a new theory. That’s science. If it’s carved in concrete can’t be changed that’s dogma. There’s a difference.
“the BBT posits a beginning just like Genesis is a beginning. “
The BBT does not posit a beginning. It posits a point in time after the beginning.
“Anyway, theories are proposed,”
Hypotheses are proposed and tested.