I feel that in his own way, he felt that he had enough backing to support his theories. In my opinion, no, I don't feel that Dracula was Jewish. McBride did not convince me of this. What I was convinced of was that Dracula was a man, who was determined to fight for his God, his faith, and his beliefs. When he felt that all he had faught for was wasted with the death of his love, he turned against his faith, leading him to darker beliefs.
Faith is a powerful thing, and love is even more powerful.
Neither of these should be messed with. The people messed with Dracula's faith, and he snapped.