Why people wont check if their own religion is wrong! Open minded.?

I feel very sorry and agitated at the same time, for the people that follow a faith blindly. They will not open their mind to just read information that contradicts their own. They will fight tooth and nail for their position, without ever researching utilizing a bias approach. If its so bad to read a contradicting view, why is it? I know that it is our responsablility to research if what we hold true, is true. It may be they are scared of what they find, or in denial, or just don't have the intellect to read and gather information on their own. But I feel very sorry for them. God tells us to pray for those we feel are blind to his love...to the truth. I'm going to do that, seriously, I'm going to do that. I just wish some would look at the overall view of what they believe in, where they got the information and how their religion has acted in the past. I've tried to go head on with many, not that I have all the answer because I certainly do not, but the head on approach is hard.