Okay, sorry about that.
Not in my experience. For example, in the church I grew up attending they would sometimes anoint people with oil and lay hands when they got sick. A lot of the times all that happened was the pathogen spread to everyone else. But the pastor and other leaders never once changed or adjusted based on those results, they just kept on doing the same thing and getting people sick.
I remember talking to my dad about it and he said prayer and faith in Jesus was more powerful than any virus. When I said that obviously wasn't the case since not only didn't people get healed, more people got sick, he criticized me for my lack of faith.
The same thing happened with all sorts of other things they would pray for or seek God's intervention on. It never once occurred to anyone that what they were doing wasn't effective, probably because they had unshakable faith.
That's not like science in any way.
That church would not remotely e scientific, and I have a major problems with what you're describing.
But others aren't that way.
Going with the example of viruses: my church is not congregating right now, specifically to prevent the spread of disease. There is belief in anointing and blessing the sick, but obviously you should take standard hygiene practices every step of the way. Also, a person not being healed doesn't automatically mean "you lack faith!". Rather, it means that God is not a vending machine: don't treat it as "I put X in I automatically deserve Y out right now". Rather, God is a parent, and sees a much bigger picture than us.
Zooming out to faith in general: you shouldn't believe anything just because a random person told you. Especially not something as important as faith. Rather experiment on God's words: test it, develop understanding, test again, etc.