I think that is the difference, there is no assumption that there is a creator, we know for sure. And you are right the 10 commandments are very practical.

But to believe in the big bang theory and evolution is making assumptions and requires to believe or have faith. I prefer to stick with what can be proven in reality. Georges Lemaitre was a clever guy to originate the theory of the expansion of the Universe in 1927 and then the Big Bang theory in 1931! I wonder how he did it!