In Revelation 5, God seated on the throne hands a book to the lamb (Jesus). If Jesus and God are one, how does God hand the book to Jesus?

How do we explain to unbelievers that God and Jesus are one when there are references in the Bible like this where they seem to be at the same place at the same time as two separate beings?

God revealed Himself in the Word as being Father, Son, and Holy Spirit. All three of these Persons are said to be God. And God is said to be One. Like your example from Revelation 5, there are other places in Scripture where Father, Son, and Spirit are all present at the same time. (e.g. Jesus’ baptism, Mark 1:9-11)

I don’t think this can be understood (or explained) by finite minds living in time and space. It’s like a fruit fly explaining how an iPhone works - except the intellectual gap between us and God is infinitely greater than the insect and the phone. God lives outside of time and space - we live inside time and space and only know of existence in those dimensions. So One God as Three Persons but not Three Gods…? I believe it, even if I don’t full understand it.