Does the Trinity Matter?

William Lane Craig gets it. I would just like to add in defense of the Old Testament revealing the Trinity that it is clear to me that the Son of God (Jesus) is the Mediator between man and God. Therefore, the communication we see between man and God in the Old Testament is through the Word (Son) that became flesh. Also, we read of numerous distinct references to the Holy Spirit in the Old Testament as well. Christ is clearly seen throughout the Bible and I agree that it is He who fully manifests the Father, Son, and Holy Spirit as Three Persons and One GOD.