If that's true then we should have some good, objective evidence to provide in support of teaching creationism by showing which coutries those are, and how they are ahead of us in science education. Which countries are those, and how is teaching creationism as science making their students better scientists than ours?
I didn't say that the teaching of evolution only is the reason we're falling behind other countries in science education. I'm saying that it has provided no benefit and that the claims that introducing creation will hurt it are unsubstantiated.
However, the correlation is clear. The quality of education has declined as evolution has had the monopoly, demonstrating that it offers no advantage. It has not helped science education in this country.