Here’s my vote. Keep your opinions to yourself.
I know you might feel like you’re betraying something in that. But hear me out on this.
What are you really trying to do here? I mean if this couple is living in sin they’re doing that every other night of the week. You’re not going to save their souls by making them feel embarrassed in your house.
Hospitality is as much a sacred duty as anything else. Giving people a shelter for the night is key to having them feel they can trust you in other things. Shaming people in that situation will not make them change their ways. They’ll just block you out from that point on.
No. Make them feel welcome. Go the extra mile to do what you can. Don’t let on that you don’t approve. That’s not your right. That’s up to God. He can make them feel guilty. Or empty. He can make them look for deeper meanings when they have children.
And at that point the one thing you want them thinking about is that really nice Christian guy who was totally straight-laced but who made them feel welcome even though they weren’t in his moral sphere. You don’t want them thinking that the best guy in the room thought they were immoral sinners. Assessed. Judged. Damned.
Last part of this is my little story. I once knew a family who wouldn’t let a friend of mine stay in their house because we were 2 single guys and they had children. They let me stay because I was Catholic. But they didn’t let him stay because he wasn’t even Christian. They’d assumed he was. And found out otherwise. And they didn’t want him to be a corrupting influence on their kids. Well that was their right. Ok.
So they made him stay in the car. Over night. In the heat.
Now on the way over to their place we’d been talking religion and the guy was searching. He was really leaning my way in that.
On the way home he was so totally turned off that there was no restarting that talk. Not ever.
Actions should show a love for people where they’re at. It should be a no questions-asked love. At least the first time you meet. You can always let your convictions show in what you do. In what you won’t do. And what you advise when asked.
Helping someone who isn’t ready is like pushing a kid’s toboggan before he has a chance to sit down. You might have meant to help. But instead it looks more like you wanted to hurt.