Out of all that I've read, I still think you support yourself well, but I think that I might have some comments here that you might be able to use as a rebuttal or may find some use for. If one questions just one of the points of a religion, the religion begins to be falsified.
Religions arise, and, change themselves out of a crises of legitimacy.
The Catholic Reformation brought by Martin Luther is an example of this. A common argument about the Bible is that it's not to be read literally, it's open to interpretation. True, some passages are open to interpretation. But that's just some, not all. Supposedly, you love God and no one else.