Unity? 

Consider this, a company of Bible-believing Christians joined together in, let us say, an evangelistic endeavor. All are trusting in the shed blood of Christ for salvation, though some are Baptists, some Presbyterians, some Episcopalians and some represent other denominations.

Are all these believers actually one? Yes, in Christ, for "there is one body" (Eph. 4:4).

What united them? The "one baptism" (Eph. 4:5) by which the Holy Spirit unites all believers to Christ and to each other: "For by one Spirit are we all baptized into one body whether we be Jews or Gentiles…" (I Cor. 12:13). The baptizer is the Spirit and that which they are baptized into the "the body of Christ." So, actually there is no water involved at all.

Yet these same believers, who all trust in the finished work of Christ for salvation, remain sadly divided as far as fellowship in the work of the Lord is concerned. They may have blessed fellowship in their evangelistic endeavor, but at its conclusion they go back to their mutually exclusive church organizations.

The reason for such division?

Basically it is that they have confused "the gospel of the kingdom" as proclaimed by Christ on earth and His twelve apostles, with "gospel of the grace of God," proclaimed by the ascended, glorified Lord through the Apostle Paul (cf., Acts 20:24; Eph. 3:1-3). Which is for today? Is it that which applies to Israel concerning the restoration of "the gospel of the kingdom" on earth, or is it the message of "the gospel of the grace of God" for the "body of Christ."

They then strive over baptismal modes and meanings, most of them still require their particular forms of baptism for entrance into their churches... while explaining at the same time that the ceremony has no saving value and that it is not required by God for entrance into the true Church, "the body of Christ."

They fail to recognize that there are two gospels ordained of God for two differing people groups that have two different eternal destinies. These two are Israel who will reign eternally on the new earth (cf., Rev 5:20, 20:6), while "the body of Christ" will reign eternally in the heavenly sphere (cf., Philippians 3:20-21, 2Tim 2:12) - both by Christ in them.

Can’t we stop being Presbyterians, Baptists and Methodists and just be Christians?

Why should the Church of Christ today remain divided and weak, when God says :"We Being Many Are One Body In Christ, And Every One Members One Of Another" (Rom. 12:5).