Christ the one mediator

Here's the beginning of a thought:

If we accept that as the Word of God there is no knowledge of the Father apart from the Son, does that necessarily mean that there is no knowledge of the Father apart from the history of the incarnate Son?

Fact 1: Christ is the only mediator

Fact 2: Christ is the only mediator in a number of ways:

1. Christ mediates God to us (in his divinity)
2. Mediates us to God (in his humanity)
3. Mediates God to us in his mediation of us to God (in his hypostatic union)

I'm no expert, but do Barthians criticise those who ignore fact 1, but make the mistake of equating point (a) with point (c) in fact 2?

In particular, can we:

• See God revealed in and through Christ in his divinity as our creator and as judge?
• and in distinction, God revealed in Christ in his hypostatic union as our forgiving Father?

Basically, I'm trying to think if you can preserve there being two kinds of knowledge of God (bringing death and life) while believing there is only one person through whom we can know God.