I was in a similar situation. When I started studying I was engaged to my high school sweetheart. She was the love of my life. But after I started studying with Jehovah's Witnesses, about 3-4 months in, she told me that I needed to make a decision. I had to choose between her and Jehovah.
I choose Jehovah and never looked backed. Jehovah had blessed me over and over again over the years. I KNOW that I made the right choice. ALWAYS put Jehovah FIRST and you can't go wrong. (Matthew 6:33) “Keep on, then, seeking first the kingdom and his righteousness, and all these [other] things will be added to YOU."
If you have the book "Questions Young People Ask—Answers That Work, Volume 2", look at chapter 3 entitled "Is This Person Right for Me?" and Chapter 35 "How Can I Become God’s Friend?"
Also you can look in the book "The Secret of Family Happiness" 2006
Look at Chapter Two "Preparing for a Successful Marriage"
Hope that this helped
If he is open to a Bible study, that would be great. I thought you said though that he was "against religion of any kind" that is why I made the comment the way I did.
Even with this, still be careful. It has happened before that someone studies just to make things go better for now, and then once you and or him dedicate your life to Jehovah, everything changes. So just make sure that if he does study, that he is taking it seriously. Of course you can't read hearts, so you have to do this to the best of your ability.
I just read your update. I know that it hurts right now, but the hurt you feel now is NOTHING compared to the hurt you would of felt if he was like that after you got married.
I commend you for the stand you are taking for Jehovah and I am SURE that He has taken note of what you are doing for His name and your relationship with Him. You will look back at this moment years from now and get down on your knees and thank Jehovah that you made this choice to serve Him and stand up for what is right.
You have a world wide Brotherhood right behind you too, including your friends here on R&S. If you need anything, just ask. We are here for you.
You will be in my prayers Sister.