Jason,
There is a distinction, the Godhead is revealed as the Spirit. The Father is also referred to as God. Jesus, Christ, Son. The Holy Ghost or Holy Spirit. What we receive is a seal, a portion, the holy Spirit of promise, the spirit that is of God, spirit of holiness, holy Spirit... capitalization is important to distinction and doctrine. In scripture, the Godhead is shown to teach us, in the inner man, our holy Spirit.
[SUP]13 [/SUP]In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise
[SUP]30 [/SUP]And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption.
[SUP]12 [/SUP]Now we have received, not the spirit of the world, but the spirit which is of God; that we might know the things that are freely given to us of God.