I understand his thinking. I was someone who use to bounce back and forth between, science and faith.
The problem I ran into with science and medicine was, it has always changed through time. Just when a revolutionary discovery is announced, in 20 years, a new one begins and the endless search never seems to hit bedrock, internally, for me.
The Bible was written a long time ago and to believers, it is still totally relevant in 2019.... Read a medical book from 200 years ago, and see how much has changed.
Another notable issue: Not knowing what the future will bring, is an inescapable dilemma on both sides.