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Physicists and cosmologists have a number of possible explanations for "what existed before the big bang". The big bang theory is just the best theory we've created so far to explain the peculiarities of the universe we see in telescopes.
The most popular theory is that this universe is the end result of a chain of universes- this theory is popular because it explains why the conditions of this universe seem so perfect for the creation of space-time and life.
This kinda pushes the "first cause" question backwards into the "turtles all the way down" category.
But science doesn't try to answer "first cause" questions - it tries to explain observations.
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