When I want to see how deep the rabbit hole of stupidity from the religious world goes, I pop onto any live YouTube space video with a chat channel running. Inbetween the disturbingly numerous flat Earth people who genuinely think human beings have not advanced technologically to the level that might enable them to have determined the shape of our planet (arguing about it on the magical internet, ironically enough), there are plenty of overly religious ones who hold equally idiotic ideas. The last time I did that, I engaged a guy with a cross next to his name who was blabbering on and on about Jesus. He wasn't sure if the heliocentric or geocentric model was right, which I reminded him of every time he said something like hell is literally located deep below the Earth's surface or that he KNOWS the universe is 6000 years old. He'd ask obvious questions any elementary school student who wasn't asleep for her entire childhood could answer for him (like "what's the difference between geo/heliocentrism?"), but when I'd flip him the answer off the top of my head, he'd claim I was Googling it. He really thought he was about to teach me some new words! I told him what I do for a living that would qualify me to answer some of those questions, but he simply didn't believe me. I guess nobody could possibly be as smart as a fifth grader to some of these religious nuts.
I finally told him he ought to stop talking like that because he makes Christians look monumentally stupid to people like me, which was true. A couple other Christians/religious types in the chat who weren't complete nutjobs agreed with me and started telling him the same thing.
"Knock it off, you're making us all look stupid."
So that's probably going to be my approach from now on: Share what's known and not known, answer questions, but if they play the monkey with the fingers in the ears and continue Bible banging as so many unfortunately do, simply tell them the blunt truth: They're stupid, and they're making all the other religious people look stupid too which isn't helping their cause. Even the Pope and that creepy Pat Robertson guy know as well as the scientists that the universe is old. The Vatican accepts evolution too, they just have their own little "there was a hand of God in there somewhere" spin on it. So they're almost there.