If you are a Christian and you attend a church and you have an attitude of "I didn't feel welcomed", and "I didn't feel approached," or "nobody talked to me!" Guess what . . . . IT"S YOUR FAULT! You're a Christian! We are SUPPOSED to initiate!
As Christians, we should never be the ones who are sort of isolated and taking up offense! We should be relational and pursuing others! And the stranger means, I don't know them and maybe they don't know my God But maybe my God put me in front of them so I could get to know them and they could get to know HIM!