I am a practicing Catholic who has found a wonderful church but in my experience most of my Catholic friends (myself included) see most of the OT stories as symbolic, intended to teach a lesson. Jesus taught many lessons through parable and analogy.
Let's face it, no American Christians are sacrificing a prize bull on the family altar to ensure the harvest or selling their daughter into slavery because she has fornicated with a man from a different tribe.
I consider my church a tool to be used by me to get closer to God, not myself as a tool for my church to use to gain power. Jesus served the people. I am not Muslim but one could also make the argument that Mohammed served the people (if one knew what one was talking about!).
I think where humans go wrong in religion is when they confuse the hierarchy of the church with God Himself. My cousin is a brilliant scientist, a geneticist busy unlocking the human genetic code and I work in the biotech field along with several family members. I count among my relatives doctors, nurses, firefighters, soldiers and a brother who is a police sergeant. My father is an engineer. We are all well acquainted with the nuts and bolts of life. We are also all religious, although not all Catholic.
The human influence of Christianity does bungle Jesus' message quite frequently, sadly enough. In the gospel Jesus says specifically not to worry too much about what you eat or what you wear because things from the outside cannot corrupt your spirit but rather, it is that which comes from within and is sent out to the world that will corrupt.
Many scientists and theologians claim that science and religion are not incompatible and in the truest, non-evangelical form of both disciplines I believe this to be true. With or without God the world must work somehow. Similarly,with or without science we are capable of pondering the meaning of life.
Where we stumble is when too much emphasis is put on the rituals and practices and not enough on the universal messages contained in most religions: the messages of harmonic co-existence and constant self-improvement. I call this the "style over substance" form of religion.