Jesus spoke (for example in Matthew 25 vs 32 - 33) about God separating people into two groups, just like a shepherd would separate the sheep from the goats. Here in Spain, where the sheep are often a brownish colour, it's easy to understand how the sheep and goats could get mixed up and all look kind of similar - at least to an outsider. But the shepherd has no difficulty distinguishing and separating them.
It's sad, in some ways, that Christians in the 21st Century are not always particularly different from the non-believers that live around them. Sometimes they blend in so much that they're not really being the "salt and light" that Jesus called us to be in our society. And sometimes there are even people who call themselves Christians, but in reality they've never made that radical decision to commit their whole lives to living for Jesus.
Yes, church folk and non church folk might look much the same to an outsider. But the Good Shepherd knows who's who, and He's calling us to be those whose lives make an impact and leave a legacy on the world around us. That can be a challenge at times, but it's also a wonderful privilege.
