My biggest problem with believing in the bible (apart from many other smaller ones) is that God often states that he is loving and righteous, but his actions show otherwise. Just look for example how many times he made the pharaoh's heart obstinate so he could kill him and many of his people.
Let's say that I convince George W. Bush to invade Iraq, and then proceed to kill him, his soldiers and every firstborn US citizen because of it. Am not I to blame?
This is just one example of the many unrighteous and hateful actions of God detailed in the bible.