It's a good thing they don't see gravity as a cultural and moral threat.
However, we can not observe, or find evidence of, a HOX gene mutation (the evolutionist's alleged biological mechanism) causing the lobe-finned fish's fins to turn into arms with hands and digits.
And, moreover, HOX gene mutations have not been known to be advantageous.
I have never seen the theory of gravity, and/or proponents thereof, used in an attack against God, the Bible, Jesus, and Christians/Christianity...but I have certainly seen the theory of evolution and the so-called related "science" used in attacks against the forementioned.
Science is not even supposed to operate in the realm of the supernatural. So when one uses it to levy an attack against Christian beliefs, they are operating outside of scientific boundaries...That is where the "cultural and moral threat " comes from (not actual science, itself).