"Trinitiarians insist the father is not the Holy Spirit and they are seperate persons in the Godhead."
Before you try to attack the doctrine best to try and get the facts right first.
1 Corinthians 2:10-12
English Standard Version Anglicised (ESVUK)
10 these things God has revealed to us through the Spirit. For the Spirit searches everything, even the depths of God. 11 For who knows a person's thoughts except the spirit of that person, which is in him? So also no one comprehends the thoughts of God except the Spirit of God. 12 Now we have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God.
The Spirit of the Father is the Holy Spirit who is the Spirit of Jesus. One name, one Spirit.
"Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit"
Romans 8:14-16
English Standard Version Anglicised (ESVUK)
14 For all who are led by the Spirit of God are sons of God. 15 For you did not receive the spirit of slavery to fall back into fear, but you have received the Spirit of adoption as sons, by whom we cry, “Abba! Father!” 16 The Spirit himself bears witness with our spirit that we are children of God
Galatians 4:4-6
English Standard Version Anglicised (ESVUK)
4 But when the fullness of time had come, God sent forth his Son, born of woman, born under the law, 5 to redeem those who were under the law, so that we might receive adoption as sons. 6 And because you are sons, God has sent the Spirit of his Son into our hearts, crying, “Abba! Father!”
John 14 is a classic in this respect too.
Stephen