I can somewhat agree with that if people blindly follow what they have faith in. but by having some doubts they can keep in check what their true faith is. You are right that a lot of people have been fooled by someone taking one's faith and twisting it just a little to get them off track. But that would work on any belief. I am not saying that I have all of the answers , Hell a lot of the Doubts I have, I have voiced here on this forum. And because of it I feel more informed then before I came here. Some things I thought I knew for sure, I have been shown that I had been misinformed . That is why searching is so very important, The problem comes when someone believes they have all of the answers and stops searching. Don't you agree?
There have been billions of people on this planet. There have been hundreds of thousands of things written. We cannot understand it all, it just isn't possible. We know some things that have been written are false, people lie hallucinate, exaggerate, mistranslate, etc.
So how do we separate the false from the true?
We look to our own eyes, our own senses, our own memories. We know that these too, can be faulty, but we start there. We see things that are true regardless of the observer, regardless of the culture, regardless of wether a person has faith, or no faith. We treat these things as true.
When someone makes a grandiose, fantastical, or magical claim, we treat it with skepticism. Simply put, if a claim falls outside of what we see and hear, what is repeated throughtout the ages without change in form....chances are it is in some way false. When it is explained in a manner that matches the truths, the things we know, shows evidence, we can then accept that, yes, this thing that seemed fantastical at first, is true.
But not before, because making decisions based on falsehoods is just plain stupid.
I don't think I have all the answers, I just have a method of handling the information being thrown at me.