Do Verses in Acts about Baptism Support a Oneness Understanding of God?

Questions about whether the fact that the apostles baptized people in Jesus’ name supports a oneness understanding of God and how to reconcile the laying on of hands to receive the Holy Spirit in Acts 8 with the idea that we receive the Holy Spirit simply by believing.

• Does the fact that the apostles baptized people in Jesus’ name support a oneness understanding of God?
• How can I reconcile the fact that the Samaritan believers in Acts 8 didn’t receive the Holy Spirit until the apostles laid hands on them with the idea that we receive the Holy Spirit simply by believing, as it says in Galatians 3:2?