For in him [Christ] dwelleth all the fulness of the Godhead bodily. And ye are complete in him, which is the head of all principality and power: ~ Colossians 2:9-10
Christ is God, the only God. The ‘Word’ is the Mind of God, the Logos. That’s how Christ is in God His Father and God the Father in Christ, His Son, and how They are in us, the believers, by way of God’s Holy Spirit.
This is not the same as a trinity, three persons in one. This is God in Jesus Christ and They as One, in us believers, and us in Them, through the Spirit (Breath) of God, His Holy Spirit. (See John 17, maybe the most beautiful chapter in the Holy Bible.)
Hallelujah! :- )