Christianity and the Bible?

Heres what troubles me, none of the books of the Holy Bible was ever written by Jesus, God, or Moses. The gospel was written according to X. We don't even know who actually wrote the 5 books of the Torah (Leviticus, Exodus, Numbers, Deuteronomy, and Genesis). Sometimes, the books even give contrasting views on subjects. While one says we should not kill, another verse commands us to , pillage, and mercilessly slaughter (read Hosea 13:16, Exodus 32:27, 1 Samuel 15:2-8) or that we are punished for the sins of our fathers (Exodus 20:5, Deuteronomy 5:9, Exodus 34:7) and that we should steal (Luke 19:29) and that we should break manmade morality and laws in compliance to God ( Acts 5:29). If we are to abide to Acts 5:29, then what makes christians more moral than muslims? If muslim extremists kill for Allah, and Christians extremists kill for God, well i don't see why they should denounce each other. See, I am a tormented christian turned to diesm after i really read the bible. Chrisitianity is a paradox, believing an all loving God, yet He commands us to do the above. AND how can I truely believe in the Bible when its not even written by the people i should worship. The only proof of truth is that "angels" supposedly came and inspired the writers, so its true.