I feel like they've had to accept an outstanding amount of evidence over the hundreds of years, but with the advent of internet circles just feedback loop way harder, except the church isn't in those loops.
Like it's just way harder currently to change the mind of someone when they're instantly surrounded by people who will reinforce your beliefs.
Though I also feel like the more difficult it becomes to change religions, the more likely they are to go away. There's a lot of thrown away crap that was thrown away because people wouldn't take it. Religion can't survive forever on the old.