Agreed. The root of the behavior of purity testing / ego-surfing is that people misunderstand the parameter of "the Body of Christ."

They infer the term means something along the line of:
>all churches
or more narrowly
>my denomination
or maybe half-way between those two extremes, as
>my denomination and those adjacent that share at least xyz belief(s)

But the Body of Christ is not a church, and it does not rest on *any belief.* (Compare that to the "calling out", the ek-kaleo, the "ecclessia", the church, which *does* rest on belief --namely, that the belief that he is the Christ (Matthew 16).)

The Body of Christ contains even non-believers. (Consider when Paul speaks of marriage between believers and non-believers in 1 Corinthians 7.)

We are to contend with one another (not making enemies of one another) to understand him as best as we can. We may even disagree and peacefully part ways till one is proved.
That has nothing to do with being of the Body of Christ.

We--non-believers, believers, faithful, unfaithful--all descendants of Adam, the wheat, planted by the Father--are joined to Christ (the head of the Body) by the Spirit (he is the head of the Body). You belong to that.
It is a statis, not a dynamic.
We are his by the Spirit--not by any church. The Spirit is not a belief. Ha claims us. We are sons.

We can reject that, but that doesn't make one not of Christ nor not of the Body. (However, it would make one not with the "calling out", the church. And that's all. It would naturally have effect on how one treats others--including how one treats the Body--and therefore affect our own judgment. The sheep will be judged by how they treated the least of the sheep.)

People forget that. And then they mistreat members of the Body.