Why are we plagued with so many dogmatic certainties and religious opinions? The ego driven agenda would put these as more important than love and unity. They are things to squabble over rather than coming to any kind of agreement. Is this not carnal?
So I have identified, more or less a few causes for these DC's as follows.
-reactions to the things we hate. (bad experiences)
-self-interest (ambitions and perceived religious assurances)
-ideological preferences
-drawing wrong conclusions based on quick and rash judgments
-personal dissatisfaction and disaffection with the status quo
Now this trend towards personal opinions or preferences short-circuits any possibility of the mind of Christ coming to the fore. The DC's get in the way of love, unity, tolerance and openness to the experience of others by creating false hierarchies of what is important.
Can I suggest that the question posed is in the light of present-day church experience and therefore the reason for them?
In the New Testament Church (NTC) the situation was quite different as in...
They met daily. So that meant there was little opportunity for things to fester and disagreement to arise.
Because they met in small groups in homes, there was little opportunity to disagree because if you did, you could discuss your problem openly and honestly.
They had no bible apart from the OT so NT teaching was by word of mouth via the apostles.
They didn't just talk the talk, they walked the walk as in how much they loved one another.
It was obvious that women were elevated to a position of care and respect, which was not the case in Roman society.
Put all that together and you have got a WOW! not a disparate group of individuals all chasing their tail.