David Lamb, a colleague, as just published a book with InterVarsity Press entitled, God Behaving Badly: Is the God of the Old Testament Angry, Sexist, and Racist? If you have found yourself asking or being asked this question, you might find this book a help. Dave doesn’t shirk from the questions that most find difficult to answer. Plus, the book is VERY easy to read. He interjects personal stories and funny media depictions of God in such a way as to illustrate his points (What do Bruce Almighty and Elijah have in common?) and does not use highly esoteric language found in some OT oriented books.
I believe you will be hooked right from his first question on page 1: “How does one reconcile the loving God of the Old Testament with the harsh God of the New Testament.” Don’t we usually ask this the other way around? You’ll see David has been thinking about these topics for some time.