What I've come to discover is that many of these institutional churches hold up some form of barrier to the unity of the Body of Christ. I have no problem with a church defining what makes it distinctive, but when those distinctions are used to push other believers out of the fellowship then it makes it hard to even discuss what should be our shared goal of worshipping our Savior.

Hey Todd. Your observation here is one which I have also experienced. And may God forgive me if I were ever a part of making needless barriers to fellowship and unity..

Prior to his death on the cross, our Savior - faithful to the end - was more concerned about others than himself. In John 17 he prayed that his church would be one, just as he and his Father were one. 

Was this a mere unity for the sake of unity? No, Jesus prayed that we would be sanctified each day by his word which is truth. Obviously we don't agree on all the fine points of his truth but all of us should desire more of it and more of him. Because the truth represents Him and how to truly love one another. And how to live each moment unto his glory.

I'm thinking now of how John Bunyan was once placed in a jail cell with a Quaker. Yet as time went by, Bunyan became more respectful and even thankful for him. Even though he had written some severe criticisms of his movement.

As for the house church movement, there is not as much unity as one would hope for... and there is little desire to co-operate with other groups of Christians. I'm speaking from what I have seen and read over the last 25 years or so. This can change though, as it should.

Let us overcome evil with good. Rather than just attacking others. And pray to the Lord of the Harvest that he would send laborers into his vineyard. The harvest is great - the laborers few. 

People need examples - not just more critics.