That's too _______ for My Liking

I think we too often do not allow for overlap in ideas. I recently finished a paper on 1 Peter 3:1-6, instructions to wives. One of the main scholars involved in the discussion of that passage is David Balch. Mr. Balch has set up this framework where the OT and Jesus' movement in Palestine are pictures of egalitarian bliss. On the other side, the Hellenistic philosophers were chauvinistic jerks who preached the domineering of women. The text of 1 Peter suggests that he is adopting the Greek approach.
At first I started to go with Balch, but I now find him very lacking. His view of the Old Testament is significantly skewed. His understanding of Jesus actions is idealized and unrealistic. But the worst part of his approach is his inability to see overlaps. He will say "this code contains this element, which is also Greek, so he is Hellenizing Jesus' message." Well, what if Jesus message and the Hellenistic ideas were not mutually exclusive?
It seems to be a problem for many of us. Ideas are conservative or liberal. Modern or postmodern. If I had a nickel for every time someone said, "that is such a liberal thing to say," or "that's a modern idea." What they mean is "that comes from a perspective I don't like, so its false." However, stating the source of an idea in no way affects the truth of the statement.
Let's take an extreme situation. Surely if anyone is reliably unreliable it is Satan. However, as most Bible readers are aware, the Devil's temptations in Scripture are almost always based in some sort of truth. When he told Eve that she would be like God, he was telling the truth. In a way. People are no different. If someone said, "There is one God," most Christians would agree. Does the truth of the statement change if that comes from the mouth of a Jew or Muslim. No.
The truth is that most things worth believing and holding on to are not unique to the Christian thought world. They may be fuller or more realized, but they are not unique. Resurrection, love, caring for the poor, etc. are found in other places.
Yet we continue to suggest that if someone gets an idea from somewhere other than us then it is wrong. I am often asked why Church of Christers don't celebrate Christmas. Let's be honest with our answer. "It's too Catholic." We don't want to lift holy hands because "It's too Pentecostal." Sometimes I wonder if we would give up acappella music if more of us knew that it was the choice of Orthodox Christianity.
Source and validity are not synonymous. In fact, they are completely unrelated. If we understood that, things would go much better.