Good question Joe!
Well, we do have Timothy who was half Jewish.
Quote
Acts 16:3
Paul wanted Timothy to accompany him, and he took him and circumcised him because of the Jews who were in those places, for they all knew that his father was a Greek.
We know he wasn't circumcised until later, and we assume he had to be baptized, but the question is when. If God had told us this maybe we wouldn't have anything to disagree on. Would his mother have baptized him as an infant when his father was not a believer if she hadn't circumcised him? I don't know!