Since you are pushing for more answers, I will go out on a limb and "play the heretic" with a theory I've had for a while.
God, in a nutshell.
It is difficult to wrap our 3 lb. brains around a God who is love, is eternal, can do whatever He wants to, but yet only does good, etc. etc. Just try to imagine God existing eternally into the past! You can't! That's why skeptics have attacked Christians on this point for centuries. I mean, He is God! How could we possibly understand Him? It's not hard to fathom that "His thoughts and ways are not like our thoughts and ways"!
Perhaps the most central theme in Scripture is that the God of love earnestly desires intimate relationship with mankind. However, another huge theme of Scripture is that the relationship between God and man was destroyed by sin. We no longer have face-to-face access to God like they did in the garden - now we "see in a mirror dimly" instead.
It seems pretty clear that there is a bit of a "language barrier" between God and man just due to the fact that we aren't God. With sin added in, we definitely have trouble understanding Him now. These "language barriers" severely limit our understanding.
When there is a language barrier between two humans, the solution is to speak in a language that the other one can understand. For instance, if I were ministering in Russia, I would either need to speak with a Russian who understood English, or I would need to speak in Russian. God does the same thing. He "speaks our language" in order to communicate with us. This is why God spoke in Hebrew to the Jews, why Jesus used a lot of examples about money and farming and spoke in the everyday language, why the apostles quoted from translations that were understandable to their audience (example), etc.
I think we need to have some humility when we're trying to "understand God". I love these verses, and think they apply perfectly here:
O LORD, my heart is not proud, nor my eyes haughty; Nor do I involve myself in great matters, Or in things too difficult for me. -Psalm 131:1
Such knowledge is too wonderful for me; It is too high, I cannot attain to it. -Psalm 139:6
One Possible Answer
I think what God has done is He has attempted to reveal Himself in a way that would make sense to our pea-brains. In doing so, He has described Himself as "Us" in some places, and "I" in other places. In some cases He appears unapproachable in His high and holy greatness, and in other cases He appears to be our friend, lover, and co-heir. At times He has revealed Himself to be sovereign, and at other times, interactive and personal.
He has shown us that He is our Father, but also shown us that He is our Brother. He has shown us that He dictates what is right (Father), He has demonstrated how to do things right (Son), and He helps us do what is right (Spirit). He has shown us that He provides as a Father (Father), that He provides as a Sacrifice (Son), and that He provides as a Helper (Spirit).
I believe God is one, and I suspect that the Father, Son and Spirit may be the different ways God has revealed Himself for the purpose of our understanding Him better.
You may object, thinking, "why would God put on an act just to illustrate something?" Consider this passage:
Father, I thank You that You have heard Me. I knew that You always hear Me; but because of the people standing around I said it, so that they may believe that You sent Me. -John 11:41-42
In other words, Jesus only prayed this so people would hear Him pray it!
I am also highly suspicious based on passages such as 2 Corinthians 3. Verse 17 states "the Lord is the Spirit", and if you study the chapter very carefully I believe verse 18 is teaching that the difference between Jesus and the Spirit is the same as the difference between the fading glory on Moses' face and the unfading glory God has destined us to. Also, the following quote from Jesus seems to indicate that having the Holy Spirit is better than having Jesus:
But I tell you the truth, it is to your advantage that I go away; for if I do not go away, the Helper will not come to you; but if I go, I will send Him to you. -John 16:7
To me this makes perfect sense, because God desires deep intimacy with us, and the Spirit dwells within us, but a relationship with Jesus was external. In other words, I think God may have been indicating that it is much better to experience internal intimacy with Him (Spirit), than external relationship with Him (Jesus). I am beginning to think of Jesus as God's way of interacting with us in a familiar form. Passages like Revelation 22 make a lot more sense in light of this view.
As a result, I think it is appropriate to say, "God was the Father of the man, Jesus", because in the "God is one" perspective, this is true. It is also appropriate to say, "God (i.e. God the Father) is the Father of Jesus (i.e. God the Son)", because in the "three Persons" perspective that God has given us, this is true.
However, I tend to think it would be inappropriate to say, "The Holy Spirit is the Father of Jesus", because:
God has not revealed Himself as the "Holy Spirit Father", and
This would be a confusion of two perspectives
If there is something about the Holy Spirit's activity in the Virgin Birth which makes us think of Him as the Father of Jesus, I would suggest that we need to constrain our language to the boundaries set forth by God in Scripture and resist the urge to use that wording.
Forgive me for challenging 2,000 years of Church doctrine with my home-brewed theology, but at least now you'll have a 2nd perspective to consider, per your request. (Looking forward to comments.)