In the history of man there are many people coming together for many different reasons.
However the church (or assembly) called by God is coming together based on the revelation of Christ.
Once a person knows Christ, that person's experience is tied to the experience of Christ. Our coming together is the same as our coming to Christ. Through our coming together there is an experience of God's kingdom and dwelling on earth. As such we promote Jesus Christ and value the knowledge and experience of this person over any specific creed, doctrine, or practice.