I've read some of Ehrman's stuff before, he is a pretty sketchy scholar. I wouldn't carry what you read from him too far. He is a good starting point for looking into things deeper, I suppose. But he is far more a salesmen than he is a serious academic.
Which is a shame, I think such half assed scholarship of the ilk of Ehrman hurts his cause far more than helps it (though in Ehrman's case, I sincerely think his cause is simply to sell books).