"The beginning of the gospel of Jesus Christ, the Son of God"
Mark 1:1 beautifully frames the gospel as both Jesus-centred and Trinitarian. The gospel is about Jesus, but Jesus can only be understood in relationship to the Spirit who he is anointed ('Christed') with, and the Father he is "Son of".
We miss the Trinitarian nature of Mark 1:1, and so many other passages because when we read "God", we don't identify God with a person of the Trinity (usually the Father); and when we read "Christ", we read it as a surname, if we're lucky as a title, if we're really lucky as about being anointed, and very rarely as about who Jesus is anointed with.
"God [the Father] anointed Jesus of Nazareth with the Holy Spirit" (Acts 10:38)