That's my worst nightmare as well.
You do have to trust in God. He's not going to send people to Hell without their being guilty. If we're in for this kind of persecution, God will give us the graces to deal with it when the time comes. We will need fortitude, mortification, and a host of other virtues. And Our Lady will help us as well.
Agreed, if there is ever a time to "fight until death" it's when they come for my kids. Sorry, even if we all get blown to bits by overwhelming force (e.g., the US Army, UN forces, etc.) it's worth it if we save our souls.
I wouldn't put myself against overwhelming force for any OTHER reason -- but my kids' salvation would be a good reason.
That's the line I won't let them cross. They don't get my kids or their souls. That's worth dying for.