Hi Gary, you raise a valid point concerning systematic theology. I too prefer to study scripture from a Biblical Theology perspective. In doing so one much more takes into consideration the style of literature, the social and historical context, and, what I call, the authorial context (the style, calling, and knowledge of the author). And thus I do not use the writings of Paul to interpret the writings of Matthew, John, or Peter, and visa-versa.
Sadly, most fellowships are built upon a specific systematic theology. In order to be a member of the church one must 1) agree with their statement of faith (systematic theology), 2) agree to a certain conduct, and 3) desire to love God and one another together. I believe this is up-side-down. A healthy foundation is 1) a simple love for God and desire to seek God together; and 2) an agreement to conduct one's self in love and respect for one another. If we do those two things, we can worship together, study scripture together, support one another (do all the one-anothers in scripture) though we radically differ on our personal systematic theologies. And maybe in the context of such solid relationships, we can all grow in our understanding of God.