Once again, truth is not biased. But when the biased are shown it, they think it is. That's their cognitive dissonance.
Metacognition is the ability to think about our own thinking by sort of taking an objective observers point of view outside of ourselves. I find this lacking in you. The most obvious example of this is that you are conflating your opinions with the truth. The truth is most certainly out there. There is no way to know for absolute certain that you have it. In the end you are taking it by faith.
Each of us should have the humility to understand that there is always the possibility (however remote) that we have made a mistake. Thus, in all cases, both parties approach a subject from a bias, because we can't be truly objective.
Yes it is obvious in some cases that one person is more rational than another. There are a few people here in this forum that are so out in left field that they need a therapist (not you). But let's not go there. I think we are talking about matters of faith here, although we both argue from rational positions.
So again, my problem with you is not that you are a Christian. My problem is that you equate your beliefs with the truth, which shows a lack of metacognition (not to mention that it is arrogant). I suggest that you pray for a little Christian humility.