Somebody feel free to correct me if I’m wrong, but wasn’t the entire (ostensible) point of these denominations liberalizing their doctrine on sex and other matters that they wanted to be as welcoming of as large and broad a membership as possible, as against the more traditional, even fundamentalist denominations?
...Oops.
The more a worldly church welcomes the worldly, the more the worldly conclude they don’t need the church.
When a worldly church preaches that all sin is okay, why should an okay-ongoing-sinner get up to go church? Sleep in makes sense.