On that day you will realize that I am in my Father, and you are in me, and I am in you.Let’s walk through this line upon line.
And when He had said this, He breathed on them, and said to them, “Receive the Holy Spirit. John 20:22
At this point, did they have the Spirit of Christ in them?
But very truly I tell you, it is for your good that I am going away. Unless I go away, the Advocate will not come to you; but if I go, I will send him to you.
Acts 2 the meaning
Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit. This promise belongs to you and to your children and to all who are far off, to all whom the Lord our God will call to Himself.”
The Spirit came on Cornelius while Peter was speaking. Clearly Cornelius had not yet received the Spirit of Christ before that event.
While Peter was still speaking these words, the Holy Spirit came on all who heard the message. 45 The circumcised believers who had come with Peter were astonished that the gift of the Holy Spirit had been poured out even on Gentiles. 46 For they heard them speaking in tongues and praising God.
The speaking in tongues was outward signs given not the importance. The importance was Christ in them as in a new creation.