I would argue that most Christians don’t really see divorce as a sin, either. They see it as a bad thing, except when its happening to them, in which case its necessary.
The biggest destroyer of marriage in our culture isn’t the homosexual agenda, its no fault divorce, and a church full of christians unwilling to take a stand on it.
But we also have to remember that, while Jesus never hesitated to call a sin a sin, he also never rejected the sinners.
No He did not. However remember his admonishment to all that he forgave was to "go and sin no more". To be truly forgiven you must honestly want to change you ways.
I get what you mean about Christian complacency. A year ago, my wife and I attended a party at the house of a church member. It was a choir party and I was along as a spouse (my wife was in the choir). The wife of the host was showing us around the house. She showed us the room of one of her sons, since moved out, who had been active in "youth fellowship" stuff at the church. She casually mentioned that his room was now vacant as he had "moved in with his girlfriend". Now, I get that young people do that, and he's an adult and can do as he likes. But I was taken aback that his mother mentioned so casually to a group of church members that her son was now shacking up with his girlfriend.