There are many people who grant that their religious beliefs may be wrong. It’s worth noting which end of the political spectrum such people are usually found on.
“ mine is the truth, duh, else I wouldn’t believe it”
I find this to be an extraordinarily irrational position. I believe all sorts of things without believing that they must be right … I believe them because the evidence that I have favors them. But I have believed things in the past that I no longer believe because I learned new things. For instance, I once believed strongly that there was a conspiracy to kill JFK, whereas I now believe strongly that Oswald acted alone. But in both cases I knew I could be wrong. I have many beliefs about history and science that could be overturned by new information … it has happened before. Why in the world would anyone think that something they believe must be true merely because they believe it? That strikes me as absurd, foolish, even deranged.