Long story short, I was a Christian up until a few months ago; I became born again Christian when I was 9 and I'm 34 now. Even as a kid I was often disturbed by God's violence in the Old Testament but I swallowed it down and kept plodding along. Over the years, the more I studied the Bible the more I noticed contradictions here and there, but again, I swallowed it down believing that God knew best and it didn't matter at the end of the day anyway.
But... lots of things have gone wrong for me and family these last 18 months and I took it upon myself to re-examine my faith. I've been on a science/evolution reading spree for the last 6 months and eventually had to admit that either science is right or Christianity is right. I chose science because Christianity just can't stand up to scientific method and investigation. I still class myself as a Christian seeker because I'm not really ready to call myself an outright atheist just yet. However, I feel that's where I'm eventually headed.
Ok, thanks for the honesty. Allow me to offer this perspective:
the study of these sciences, coupled with the hard economic times we're ALL facing lately, should be a process of growth. Painful, but beneficial in the long run.
1) You need to re-examine the claim that "either science or Christianity is right." The early Church never looked at it that way, and the overwhelming majority of Christians don't either. We've participated in enough threads with poster humble humility that I feel I can point out it is not very humble for you to take this stance, calling so many others wrong, about what many of them must know more about than any of us here.
2) There is nothing about the Bible that was written to be a science textbook. For any of the sciences. There are some statements here and there that directly prompt a desire to learn, and this is in line with "the spirit" of the whole Bible; but there are many other better prepared people to discuss such things with you. My convictions are settled, and I have gone through the process you are now enduring. There is a light at the end of the tunnel ...

You could start with recognizing how the original audience would have understood the first few chapters of Genesis, which is as simple as God proclaiming Himself to be above the gods of the surrounding peoples. In order of their importance. Couple that with what the concept of "god" meant in that day and age, and the new insight will do you a world of good!
3) I am in favor of re-evaluating our own beliefs. This is very Scriptural, and G-d can stand up to scrutiny. Quite well!
4) I can't and won't say that your lifetime "issues" w/ the hard passages of the OT mean you were never really saved, or that it makes any statement at all about your present condition. I WILL say that this is one way G-d Himself draws us closer to Him, and I urge you to answer that call with integrity. I hesitate to offer specific understandings the Lord has shown me, because they are, you know, for
me. We all see through a glass darkly, and the unique perspective G-d will show
you that ultimately establishes your Faith deserves the chance to flourish, not be squashed out by me or anyone else.
5) ALL the apparent contradictions in the Bible can be harmonized so that they peacefully co-exist as Truth, and likewise those passages that are "hard" can be understood in ways that are consistent with who Jesus is. I'm not saying this is easy, but I AM saying that until we go through that process, we shouldn't feel we really know what ANY of it means. Please don't underestimate the gravity of what I just said. Along those lines, have you ever considered fasting?