Yeah, this is about what you ought to expect. He doesn't want to bear the brunt of the passive-aggressive nonsense that he knows he'll get if he gives a straight answer. He probably also realizes that if he tells them you're a full-blown apostate that you'll become the subject of a lot of gossiping and slander, not to mention the cruel practice of shunning. On some level, he may realize that you're right but is afraid to face it and knows that seeing you mistreated in this way will only prove you right.
It's a tough spot for both of you to be sure. Cut him some slack and have some patience and pity - he's just a human operating under the undue influence of a cult. I know first hand how difficult it is to separate a spouse's genuine personality from what they do and say in cult mode in your mind, but I think it helps to remember that they're trapped in a cult and therefore in just as bad a situation as you're in even if they don't realize it fully.