Can I, a doctor, save 10 billion lives in another world?

Reading Manga Can I a doctor save 10 billion lives in another world at Manga Website
I want to save all the lives in the world. With that sentiment, I worked as a doctor in a corrupt environment. Still, due to sudden death, I found myself reborn as a prince named “Eiji.” In a world where “religion” and “god” prevail, and no doctors could be found, witnessing the many lives lost due to these misguided beliefs, I used all of my knowledge from my previous life to perform surgeries and develop medical equipment.
Which is the one that saves lives: God or Medicine?
With the knowledge of 5000 years of medical history, both god and disease will be eradicated! Even if I have to go against god, I will save lives!
Burakku Ishi no Ore wa Isekai de 100 Oku no Inochi Osukueru ka?,
ブラック医師の俺は異世界で100億の命を救えるか？
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