The “big bang” in concept supports creation theory in that it shows the universe had a beginning. Anything that begins to exist has to have had a creator. This refuted the athiest position at the time that the universe was eternal and thus needed no creator (the “steady state” universe theory). The fact the universe had a beginning is an overwhelming rational argument for the existance of God.
Just read www.geraldschroeder.com. The Israeli physicist explains how 6 days = 14 billion years, completely in line with the Torah.