The fellowship of believers is the true institution that Jesus came to establish on Urantia, also called the brotherhood of the kingdom of heaven or the spiritual fellowship in eternal realities. Jesus delivered his apostles and his successors the keys of the outward kingdom, that is, the authority over things temporal, the social and economic features of this association of men and women. But not about the whole association. 
Jesus declared that he who is not against us is with us. He warned against establishing unlimited administrative and jurisdictional control between groups of believers, which is just what happened with Christianity.  The true church—the Jesus brotherhood—is invisible, spiritual, and is characterized by unity, not necessarily by uniformity.  Jesus pledged full support for social and nonespiritual decissions of his apostles provided all agreed.  Jesus used the term fellowship of believers as synonim for kingdom of heaven. 
This brotherhood of believers is destined to become a living organism in contrast to an institutionalized social organization. It may well utilize such social organizations, but it must not be supplanted by them. 
The kingdoms of this world, being material, may often find it necessary to employ physical force in the execution of their laws and for the maintenance of order, but this does not nullify the right of social groups of believers to maintain order in their ranks and administer discipline upon unruly and unworthy members. 
No intellectual, social, and moral distinction should be made in the spiritual brotherhood of men when they come together to worship in the presence of God.  There should be no place for sectarian rivalry, assertions of moral superiority, or spiritual infallibility. 
Living associations, human families, social groups, or the Paradise Trinity are not augmented by mere arithmetical summation, is far in excess of the simple sum.  Spirit gravity creates cohesiveness among believing persons, groups.