Scot McKnight reflects on Dietrick Bonhoeffer's Life Together:

Leaving the church because it does not meet our expectations is failing to understand what a church is; we have a church because we have failed to meet God’s expectations. Failed expectations, then, are the foundation of the church and the reason for its existence.
Leaving the church because it does not meet our expectations is to create a church for ourselves. It is, if I may be so bold, idolatry.
Many enter into ministry with the ambition to make a church what they think it could be instead of what it is.
Until we understand what the church is — a fellowship of sinners at different locations in a journey — we will not understand what the church could be and can be. No two Christians are perfectly compatible — in theology or praxis — and therefore there will be tension in the church, which is precisely where we need to begin to see what the church is. Not a fellowship of those who agree or who are alike but a fellowship of those who don’t agree and who are not alike. When we demand the church be like us, or like our vision for what it is, or we leave, we create our own church — and eventually (if we have the guts) we start a church that begins the same old process of a fellowship of those agree who eventually become those who disagree and who split.