if the big bang was the start of all life in the universe, what was before that?

is it possible for humans to even think in terms of everything, before the big bang, as always being there?

can our minds even imagine the concept without asking "what was before that"? if we cant imagine that, does that mean there is a limit to what humans can understand?

the idea of god and the big bang theory are stomped by the same question, what existed before they did? if the universe and god have always been here, how does that make any logical sense based on what we know about existance?

all these questions are really the same question asked differently in an attempt to ask the question in a way they could be fully understood.