Many of the pious will insist that they don't judge. They hate sin, not sinners. But ultimately Christian fundamentalism is about being right, not being good. It is weeding out divergence, differentness, disagreement, deviance and selecting for conformance and submission. So at the end of the day it's a power play. And not a very sophisticated one; it's about on the same level as bludgeoning you into joining some middle school clique.
The fabrication of the concept of "sin" by pious and arrogant religionists was a most sinful deed!