I seriously doubt the change in liturgy had much to do with skepticism toward the church. Conservatives brought that on themselves by sabotaging the conclusions of Vat II's Pontifical Commission on Birth Control to protect its own authority. Obviously it had the opposite effect. And the zeitgeist of the sixties was anti-authoritarian.

The church hasn't changed its dogma on marriage one iota, so I'm not sure what you're on about there. Yes, progressives agitate for changes that respond to the revelations of science and the expansion of the circle of sympathy. But it's not like the church has budged. Officially, anyway.