Colossians 2:9 For in him the whole fullness of deity dwells bodily.

In Colossians 2:9 the word for Godhead is theotes which singular deity.

The challenge for Trinitarians: Is the Father deity separate from the Son deity?

Also: Is the Holy Spirit deity separate from the Father and Son deity?

I shall give a scripture that should open some eyes:

Colossians 1:19-20 For in him all the fullness of God was pleased to dwell, and through him God was pleased to reconcile to himself all things, whether on earth or in heaven, by making peace through the blood of his cross. (NRSV)

See http://aggreen.net/beliefs/beliefs.html#Trinity

While the understanding of the Trinity took some time to develope in the Church, based on the Scripture texts, the simplist way to get some 'grasp' of it is to say that it is of the nature of God that God cannot be contained in only 'one person' as humans are.

God's activity of Knowing and Loving make a 'trinity of persons' the very makeup of God. That's just the way God IS!

We also had a rather extensive discussion of the Trinity on this thread. Maybe it addresses some of the issues being raised.