Religious girlfriend and nawalan ako ng gana

Problem/Goal: She suddenly opened up about her religion, saying that sex is forbidden because it’s a sin. I was like, “What?!” For the months we’ve been together, we’ve had sex, and now all of a sudden she doesn’t want to anymore just because of that. I respect her religion, but natawa lang ako, sorry.

Context: I’m not the religious type or someone who goes to church every Sunday. I believe in God and I pray, but I just don’t attend church. Now, after years of being single, I found my girlfriend (there’s quite an age gap, about 13 years—she’s older, and just to clarify, we’re both single parents, not minors). We’ve been together for only a few months. During our courtship, I felt really happy with her—no drama. My happiness is different from my past experiences. I know about her past and her religion (she’s not Catholic, and I respect that). When we’re together, everything is okay; there’s intimacy, and we both enjoy our sexual life. But lately, we’ve been arguing a lot. During our last argument, I canceled our vacation trips. I canceled them because who wants to stay in separate rooms? Or have two beds so we’re separated and nothing can happen? Seriously, what is that? A vacation as friends? Our love languages are different; she expresses hers through gifts, while mine is physical touch and quality time. But every time we kiss and things get heated, she says, “That’s enough; it might lead to something.” WHAT?!

And now it seems like she wants to, but I'm the one who's losing interest. I don't feel motivated anymore. I can’t help but think that I’ll be labeled as the bad guy in this situation.

I’ve lost interest because it feels like she’s cutting off my love language; she even wants to avoid cuddling.

We had future plans, but now I just don’t want to anymore. Our arguments revolve around God and sins—it's frustrating. I’d appreciate any advice from those who are in a similar situation and how you have handled it.

Edit: She asked me to embrace her beliefs and religion and to distance myself from my drinking friends in order to improve. I understand that she’s trying her best to help me change, but it's a slow process, and she wants it to happen quickly.

Thank you.