Note 2 at 1Co 12:13: This is not describing water baptism (see note 9 at Mr 16:16 and note 2 at Ac 2:38) or the baptism of the Holy Spirit (see note 5 at Ac 1:8 and note 6 at Ac 2:4). There is more than one baptism mentioned in Scripture (Heb 6:2). The word "baptize" means to immerse (see note 4 at Mt 20:22), and it is applied figuratively to a number of things (see note 5 at Ro 6:3).

In this instance, this is speaking of something that takes place automatically to every born-again (see note 2 at Joh 3:3) believer immediately upon salvation. Believers are placed (baptized) into the body of Christ (see note 14 at 1Co 12:27). That means believers are united with Christ in a very real way and also to each member of Christ's body.

The Lord has united all of us born-again Christians by baptizing us into the body of Christ. That is already a reality. Like it or not, want it or not, all Christians are completely one in their spirits (see note 3 at Mt 26:41) with all other Christians. Any failure to function as one in our relationships with other believers means someone is not flowing in the Spirit. Our flesh (see note 3 at Ro 7:18) is the part of us that gets in strife with other believers. As we operate in the Spirit more and more, we will come more and more into unity with our brothers and sisters in Christ (see note 1 at 1Co 1:10).