They are true believers and have no disagreements. The reason for this is that they know the theory is true. When believers know that strongly that something is true they don't question it. (Notice how absolutely no proponent of evolution here, ever questions even one little thing about it.)
And "when you don't question it, you're living by faith, not by science."(Ian Stewart, quoted from Does God Play Dice? The Mathematics of Chaos)
For these people here, few of them scientists, mind you, they are defending dogma
I only play with the unserious one-armed boat rowers for so long and then it gets boring going in circles.