Is not the church Christ's Body? Can the church be in different organizations?
The answer is found in Ephesians 1:22-23. "And He put all things under His feet, and gave Him to be head over all things to the church [ekklesia], which is His body, the fullness of Him who fills all in all."
In his discussion of these verses in Word Studies From the Greek New Testament, Kenneth S. Wuest writes, "The Church [ekklesia] is described as that 'which is His body.' The word 'which' is hetis 'which is of such a nature as,' and has a qualitative nature to it." The nature of ekklesia in this context comes from the association with its head, Jesus Christ.
Of the word "body," soma, Expositor's says:
The word soma, which passes readily from its literal meaning [the human body] into the figurative sense of a society, a number of men constituting a social or ethical union, . . . is frequently applied in the N.T. epistles to the Church, . . . as the mystical body of Christ, the fellowship of believers regarded as an organic [living] spiritual unity in a living relation to Christ, subject to Him, animated by Him, and having His power operating in it. The relation between Christ and the Church, therefore, is not an external relation. . . . (vol. 11, "Ephesians and Colossians," p. 56, emphasis ours)
In other words, it is not bound by human convention. It is not bound by corporate laws that men establish, for Christ is in the ekklesia wherever its members may be.
Continuing from Wuest's:
The relation between Christ and the Church, therefore, is not an external relation, or one simply of Superior and inferior, Sovereign and subject, but one of life and incorporation [within Him]. The Church is not merely an institution ruled by Him as President, a Kingdom in which He is the Supreme Authority, or a vast company of men in moral sympathy with Him, but a Society which is in vital connection with Him, having the source of its life in Him, sustained and directed by His power, the instrument also by which He works. (ibid., pp. 56-57)
This is the usage of ekklesia in the New Testament. It is a mystical body with no external relations. It is something that is internal; it is something mental; it is something of the spirit. It is not bound by race, by language, by city or state or nationality. It is not restricted to the earth or to time.
The word mystical means "having a spiritual meaning or reality that is neither apparent to the senses [an external relation, sensed by the eyes, ears, nose, mouth, touch] nor obvious to the intelligence; involving or having the nature of an individual's direct subjective communion with God" (Webster's Ninth New Collegiate Dictionary, 1985, p. 785). The church, the ekklesia, consists of those who have been called out by God, summoned by Him, to receive His Spirit and have direct communion with Him.
For as the body is one and has many members, but all the members of that one body, being many, are one body, so also is Christ. For by one Spirit we were all baptized into one body—whether Jews or Greeks [transcends national boundaries], whether slaves or free [transcends cultural or social status]—and have all been made to drink into one Spirit.
The ekklesia is not a humanly defined corporation, but the mystical body of Christ, having the Spirit of God.