I'm so very glad to hear that you stood your ground concerning your faith & it's good that is the road block to the marriage because it needs to be a road block as much for you as it is for him.
Hold onto your faith stronger than you hold onto anything else in your life as God will give you eternally something that no man can give especially one who is trying to pull you away from your faith.......you have me standing with you & my prayers are with you for strength & growth in your faith.
Only way he would be totally changed enough for marriage would be if he would come to believe your faith. Eternity is a lot more valuable than the "hear & now"
I know for me, my faith has grown so much over these last 8 years when God has provided for me better than my H ever did....not in material ways, but in providing in difficult situations that are things I know only God could have done.
Any time you need any support or have any questions....you are always welcome to PM me. I am so Glad that God revealed the truth to you & gave you strength to stand strong in your faith......

....you are in my prayers