I have a relevant anecdote. My friend and I live in SC, which is about 90% Christian. He's in the post office one day and the line is slow, and an older gentleman starts exclaiming how wonderful Christ is and goes down the line prompting each person to proclaim their agreement that Christ is wonderful. He gets to my friend, who says 'actually, I'm an atheist'. The guy is a little taken aback but doesn't get mad or anything. He just asks the next person, a little old lady, how wonderful they think Christ is. Her reply is 'actually, I'm Jewish.'
Which just does to show that in an area that's 90% Christian, a group of 20 random people is likely to have a couple of non-Christians in it, so the odds aren't really in your favor that everyone is going to be a Christian in that situation. And when meeting strangers, you're likely to be wrong on about every tenth person. I wouldn't be comfortable making an assumption like that for every case if the chance of me be wrong is 10% every time. Maybe if it was .01%.
Which just does to show that in an area that's 90% Christian, a group of 20 random people is likely to have a couple of non-Christians in it, so the odds aren't really in your favor that everyone is going to be a Christian in that situation. And when meeting strangers, you're likely to be wrong on about every tenth person. I wouldn't be comfortable making an assumption like that for every case if the chance of me be wrong is 10% every time. Maybe if it was .01%.
I'm not anti-Christian. I'm anti-stupid.