Why is Christ's ministry described as a separating ministry?

The ministry of Christ is fundamentally a separating ministry, articulated in passages like John 15:2-6, where He employs the metaphor of the vine and branches. This imagery illustrates that not all who appear to be connected to Christ are genuinely part of Him. The branches that do not bear fruit are cut off, indicating that there are distinctions made between true believers and those who only superficially associate with Him. Throughout His ministry, Christ frequently delineated between the sincere and the insincere, making His teachings a clear dividing line. This ministry of separation emphasizes the need for true faith and a vital, ongoing relationship with Christ.