I've had my morning coffee so here goes.
I think this an individual thing from person to person.
1. Some people flock to a religion, that see things in black and white, and don't allow for shades of gray. It's either right or wrong. They literally intepret the Bible in that manner.
2. I don't think anyone can be open or closed minded, about everything. Some people know what's right for them, and stick to it. I like to think that, people look in terms, of shades of grey, as there are few absolute answers.
3. I think some people have an overpowering type personality, and are strong in their convictions. Whoever disagrees with their point of view, is going to be in an argument. I tend to avoid this type of person.
Random observations:
1. You can't open a closed mind.
2. A person convince against their will, is of the same opinion still.
3. Agree to disagree respectfully.
4. If number 3 fails, "don't let pople rent space in your head" That's them, this is me, and the twain shall not meet.
Life is too short to be too little.
__________________
"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).