Initially, the God of the Old Testament might seem overwhelming and domineering to you, or tyrannical, or perhaps even evil, which is good. It is the first telling that God is indeed God, by sheer definition, and not some ear-tickling fairy by which one in his depravity is guaranteed to find another form of stale romanticism or love at first sight. For such a first impression as the latter would be problematic to the essence of Christianity. Therefore the Christians are right in saying that the nature of imperfect men cannot ultimately co-exist with the nature of a perfect God; and that the hope of each man is now desperately found in God's sending of Christ.
If I were to believe in God enough to call him a murderer, then I might also believe enough that he, as a spirit, exists beyond death; and therefore only he could do it righteously. For the physical being kills a man and hatefully sends him away, whereas God, the spiritual being, kills a man and lovingly draws him nigh.