We all have our preconceptions. Some are stronger than others. But we have them, none the less.
None of this means you are necessarily wrong. It means that you would probably believe the same whether or not you are wrong.
Sure, there are other factors involved. Our personalities play a great deal in our beliefs.
I'm a synic by nature. I tend to not believe in things unless I have proof. The greater the claim, the more proof I require. Some people are not as cyncal, they believe without much questioning. I don't understand them. But I understand that they might not understand me either.
I suppose the point I wish to put acroos is, don't accept things as true or false just because you come from a different perspective.
We see it often.
In politics, republicans and democrats often disagree merely based on party lines. Some of what the other side does and says makes a lot of sense, but we fail to see it because "they are not us". Stop that!
In religion, people can see the flaws in someone elses faith, but fail to see glaring flaws in their own. Christians hate Muslims, Muslims hate Jews, Everybody hates those pesky Hare Krishnas...Stop it. You're all delusional to a point.
Can't we just accept that we all are a little different. Those differences are what makes it all so fascinating to me. Go on, give it a try :-)