I'm sure these folks would disagree with you...
45 million aborted in the USA since 'legalization'
Armenian Genocide
The Holocaust
the Burundi Genocid
Rwandan Genocide
Darfur
Stalin's Great Purge,
Killing Fields of Cambodia,
the Hama, Jallianwala Bagh,and Tlatelolco massacres.
the Nanjing Massacre
Muslim Bengalis
I'm guessing the answer is going to be "None.".
That list was of people weilding the power of science and technology for evil. You can’t blame a gun for killing an innocent person.
As for how many lives science has saved, I’d say about every person who has ever been to a hospital, been immunised, never been attacked by wild animals, never been killed by diseases... the list is endless. You sure make for a stubborn luddite, don’t you?
How many religion has killed? Chalk up a list of wars from the beginning of time, that had been started for some idiotic religious reason or the other.(Hint: The list of the inverse would be easier to compile.)