Objection: Islamic apologists argue that Jesus' promise of the "Comforter" (or "Counsellor") is a prophecy of Muhammad. They often claim the original Greek word was Periklutos ("the praised one," matching Muhammad's name) rather than Parakletos.

Christian Defense: Jesus was unequivocally prophesying the coming of the Holy Spirit, not Muhammad. This is demonstrated by the text itself:

• Manuscript Evidence: There is no manuscript evidence for the word Periklutos. The Greek word is Parakletos (Comforter/Advocate), the exact title used for Jesus Himself in 1 John 2:1. Thus, Jesus promised "another" Comforter of the same spiritual nature.
• Given to the Disciples: Jesus promised the Comforter to His immediate disciples ("He will give you"). He also said the Comforter would be with them "forever," whereas Muhammad died in 632 AD and is buried in Medina.
• A Spiritual Entity: Jesus describes the Comforter as the "Spirit of truth" whom the world cannot receive or see. Furthermore, Jesus said, "You know him, for he dwells with you, and will be in you" (John 14:17). Muhammad was a mortal man, did not dwell with the apostles, and could not dwell "in" them.
• Glorifying Jesus: The Comforter's purpose is to glorify Jesus (John 16:14), bear witness to Him, and remind the disciples of Jesus' words. Muhammad drew attention to himself and contradicted Jesus' core teachings.
• Fulfilled at Pentecost: Jesus instructed His disciples to wait in Jerusalem for this promise. The Holy Spirit visibly and powerfully descended upon them ten days after the Ascension (Acts 2), completely fulfilling this prophecy.

In one sense Jesus and the Holy Spirit are the same. But, in another sense they are not the same. We would say that Jesus and the Holy Spirit both are divine in essence since they are members of the Trinity. So they are both God in nature. However, they are not the same person. A "person" can speak, has a will, recognizes others, etc. This qualifies as personhood. So, Jesus and the Holy Spirit are not the same (person).

The doctrine of the Trinity states that there is one God who exists in three distinct, eternal persons: The Father, the Son, and the Holy Spirit. Though each member of the Trinity shares the same nature as being God (Ontological Trinity), they do not all have the same functions (Economic Trinity). For example, the word became flesh and dwelt among us as the person of Jesus (John 1:1,14). The Father did not do that, nor did the Holy Spirit. So, there is a distinction between them. Furthermore, Jesus said that he would send the Holy Spirit in John 15:26, "When the Helper comes, whom I will send to you from the Father, that is the Spirit of truth who proceeds from the Father, He will testify about Me." So if the Holy Spirit and Jesus were the same, it would not be possible for Jesus to say he would be sending the Holy Spirit. Also, he referred to the Holy Spirit as "he" not "me."

There are false groups who teach that the Trinity is not true and that God is a single person who manifests in different forms. These are oneness Pentecostal groups and they are not Christian in their teaching false doctrine.