Not true. In the middle ages the average life expectancy of someone who made it to 25 was their 50s.
All wealthy men.
Only about 20 years or so.
But you’re right in that the biggest jump has been in the last 50 years or so. This also coincided with the vague boogeyman of “modernism” so many seem to be afraid of.
The average education increased in that time as well. Honestly, that’s probably your biggest problem. Religious devotion and education are often oil and water.