We are all baptized in the same body. For by one Spirit we were all baptized into one body—whether Jews or Greeks, whether slaves or free—and have all been made to drink into one Spirit. For in fact the body is not one member but many.
Kingdom citizens are part of the whole body, infused by One God. That one Spirit Paul is speaking of is the Holy Spirit. This Spirit connects us to the Father, because He (meaning the Holy Spirit) is an extension of Himself.
Matthew 3:11 Mark 1:8 Luke 3:16 I Corinthians 12:13-14