You will undoubtedly receive many different answers regarding your question given interpretation of an idea relies solely upon an individual's ideals and thoughts regarding a work.
That being said, here are my thoughts.
I do not necessarily believe that Shelly, in the novel Frankenstein, was warning against science or medicine. Instead, I believe that she was warning against the manipulation of nature.
Man was not created to create life; yes, he is a part in the process, but the actual giving of a life belongs to woman. In nature, is is the "job" of the woman, or female of the species, to birth the next generation. God, if you are a believer in Christian thought, created woman so as to sustain mankind. If you do not follow Christian thought, you cannot deny woman's historical and scientific place as the one responsible for giving birth (besides the seahorse).
This being said, Shelly's novel places Victor as the new "Eve". He is the one who creates a new life- as a man. Another way that one could look at Victor's mirror of Eve is through her sin- she was the one who took the apple from the tree and, therefore, allowed sin to enter the world.
Shelly, for me, seems to be speaking more against the taking away of God-given rights. Victor takes away the ability for woman to be the only one to create life and, therefore, his actions become sacrilegious.