One of the really dumb ideas floating around Post-Modern "Christian" circles is this idea that "God is Bigger Than Your Systematic Theology" and "if you think that you can understand God then your not believing in the true God".
Here is a wonderful quote from one of the early reformers, Philip Melancthon that gives a far more Biblically faithful perspective on this matter:
Now, although all the minds of men and of angels stand in wonderment in admiration of this mystery, that God has begotten a Son and that the Holy Spirit, the Sanctifier, proceeds from the Father and the Son, yet we must concur in this, because, as has already been said so many times, we must believe concerning God as He has revealed Himself. The heathen wander about in their hearts seeking a god according to their own speculations; but the church knows the eternal and almighty God, our Creator, as He has revealed Himself. Although we cannot probe this mystery to the depths, yet in this life God has willed that there be at least a beginning of knowledge of this subject and that our worship be distinguished from the worship of false gods. He has given in His Word a revelation by sure testimonies. In this Word, like a fetus who draws nourishment in the womb of the mother through the umbilical cord and the organs of reproduction, we sit enclosed, drawing our knowledge of God and of life from the Word of God, so that we may worship Him as He has revealed Himself. (Loci Theologici, Vol. 1 Chap 2)