What to do when a long term partner finds religion?

I've been with my partner for 12 years, we are engaged to be married. Everything was damned near perfect in our relationship and then out of the blue he announces that he's found god. As a result of this he's putting this ahead of his relationship with me. We own a house together but he says we are living in sin. He will not have sex with me anymore as he thinks it's sinful and will destroy the connection he's made with God. I feel betrayed that he's gone off and found a connection elsewhere, it's as if he's cheated on me but worse in effect. I feel like I'm not enough for him. I'm devestated that he no longer wants to sleep with me. It's not about the sex but it's about that deeper connection that it brings to our relationship. He wants to wait until we are married but he's now not even sure if he wants to marry me because he doesn't think we can make this work. He's told me that there are no compromises in his religion and I'm finding that really hard to believe. Is there anyone out there who can offer some advice or resources? Is there a compromise we can both make which won't make him feel like he's ruining his relationship with god? By all accounts it feels to me as though he doesn't care about the damage he's done to our relationship with this. I'm completely heartbroken and I can't just act like everything is fine when it's not 😭
What to do when a long term partner finds religion?
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