I want to know divorce rulling regarding my case

I have been married for 14 years and we have two daughters. As a family we practice Christianity but from the point of view of institution we mention Hinduism. My husband is a police officer. And I am a teacher by profession. He has been in a relationship with one girl after another since our marriage, but I have been living with him in accordance with everything. He recently had an affair with a Muslim woman and decided to marry her. He has also decided to change his religion. I still want to be with him because I think we have two daughters. I told him you get married but don't leave me. But he won't interested to keep me. He says he will give me a notice of divorce and if he converts from Christian to Muslim, his marriage with me will be dissolved. So he will leave me like this and marry that Muslim woman. Now my question is 1. I want to know what rules I can use to keep my relationship from breaking up. So that he cannot divorce me. 2. And if he changes his religion and gets married, will it really be legal? 3. If I never divorce her from my side, will the divorce be effective? 4. And if he divorces me while he is a Christian, will I get alumni from him? 5. Is there any special alumni law on him that he is a police officer? Please let me know, I am in a lot of trouble.