You don't think you do, but I wager a lot of money that you do. Your morality is compatible with parts of the Bible, but you ignore large swathes of it that you consider immoral. You consider these parts -perhaps?- to be the additions/corruptions of the flawed humans who wrote it, but you nonetheless ignore them.

Ergo, it seems obvious that you are not using the Bible to determine your morality. If you were, you would have no way of determining which bits were moral and which immoral.