Some early church fathers believed that each person had not only a good angel assigned to him/her, but a demon as well. The belief in guardian angels has been around for a long time, but there is no explicit scriptural basis for it.
It cannot be emphatically answered from Scripture whether or not each believer has a guardian angel assigned to him/her.
Jesus said to His disciples in John 16:7........
“Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.”
John 14:6........
"And I will ask the Father, and he will give you another Helper, to be with you forever."
The Holy Spirit has many functions, roles, and activities. First, He does a work in the hearts of all people everywhere. Jesus told the disciples that He would send the Spirit into the world to “convict the world of guilt in regard to sin and righteousness and judgment” (
John 16:7-11). Everyone has a “God consciousness,” whether or not they admit it. The Spirit applies the truths of God to minds of men to convince them by fair and sufficient arguments that they are sinners. Responding to that conviction brings men to salvation.
Once we are saved and belong to God, the Spirit takes up residence in our hearts forever, sealing us with the confirming, certifying, and assuring pledge of our eternal state as His children. Jesus said He would send the Spirit to us to be our Helper, Comforter, and Guide.
It seems to me that the Holy Spirit is to do what we think angels are doing.