read the book "captives of a concept" by don cameron. Your husband does not have to be "gung ho" in order to still be under the control of the organization. He is likely still "captive" to the concept that this is somehow someway still God's organization.
Go VERY slowly. But I will warn you......if he is not ready to see the truth.....he will not allow himself to regardless of how sound your reasoning is or how many facts you present. The only thing you can do is ask sincere questions that he will have to seriously contemplate and research prior to answering you. But even that may not work. I don't mean to rain on your parade but I know from experience. I am going through a divorce because I tried to share what I knew with my wife. Your husband may react the same way my wife did when I asked thought provoking questions to her. "I don't owe you ANY explanation! I will not discuss this with you!"
Simply put.....if he is not ready to see TTATT......at the very least.....he will clam up and refuse to talk about it. At the very worst....he may accuse you of apostasy, leave, and turn you into the elders (what happened to me)