By what spirit are you living?
For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit. (1 Corinthians 12:13 KJV)
All those baptized in the family of God have been quickened alive by the Spirit of God into His spiritual family. All who have been baptized have put on the Holy Spirit of God in their heart and are led by His Spirit rather than aligned with the darkness of the god of this world.
This verse does not say all believers are immersed into one all-encompassing church. There is not a universal church as many of the world’s predominant false religions are busy about establishing. There are spiritual differences in the world’s religions which cannot be agreed upon because of a wide variance of teachings far from the Truth found in God’s Word.
All true believers have been introduced to the spirit of God who dwells inside of their heart. God’s Spirit brings Truth, nudging of the conscious, genuine repentance, and discernment of what is truth. Drinking in one spirit is to live under the holy and righteous influence of the truths of God rather than anything derived of man.