Maybe you have heard that there are a ways to categorize people and things. Two common ways to think about categorization is either as a bounded set or a centered set. Do not let the language trip you up, they are very intuitive once you know.
A bounded set is defined by its boundaries. If it metal and has wings, it is a plane. If you have blue eyes you don’t have brown eyes. We can group things into “sets” based upon the boundaries we draw. This is so common of a practice, that I bet you had no idea it had a name!
The other type of categorization is what is called a centered set, which is a group that is not defied by it’s boundaries but by the center. If a bounded set is concerned with who is ‘in’ and who is ‘out’, a centered set is concerned with the direction a person is moving. Are they moving toward or away from the center.
Image from: https://thehappypastor.wordpress.com/tag/bounded-set/
It might be easy to break this into a conservative/orthodoxy/bounded set verses a liberal/orthopraxy/centered set debate. However the reality is that Christianity is not a bounded OR a centered set.
Christianity is both.
Christianity is a way of living in that world that puts Christ at the center of our lives. Thus it is a centered set. It is a faith that understands that Christ and Paul and the early church worked did so much to break the idea of religion as a bounded set. When Jesus ate with prostitutes and Paul welcomed gentiles, when Jesus called a tax collector and Peter was told to not deem anything unclean which God declared clean, it is clear to me that one of the Christian projects is to dismantle bounded set categorization of people.
And yet, you may see, that to be a people who are centered on Christ who calls us to reject bounded set thinking, Christianity paradoxically becomes a bounded set.
To put it another way: Christianity is bounded set centered on the one who calls for the dismantling of bounded thinking.
This is a paradox, a mystery of the faith. Be mindful of those who might say that Christianity is only one or the other. To remove one set from our call is to cheapen and soften the challenging call of Christ.