AIO to my boyfriend’s beliefs when it comes to sex?

I was having a lighthearted conversation about random stuff with my boyfriend before going to sleep and the topic of sex was brought up. I jokingly said “Isn’t the point of sex to enjoy it anyways?” and he replied with “No it’s not. The point of it is to procreate.” I nodded because he was right if it was purely from a biological perspective (as in having children to have another generation of humans and avoid extinction) so I went “Well yeah, and that.”

I didn’t think too much of it until he continued his thoughts and started talking about how sex without the intent of procreating is a sin. He then told me that the times we’ve had sex together were technically a sin because there was intention to reproduce. (He’s a Christian and I’m not.)

I often have a hard time describing my feelings if they’re negative and understanding the reason behind them during the moment I experience said emotions, so I kind of just stopped adding on to the conversation even though I got upset right after he said that. It took me until way after he fell asleep for me to think about it a bit more.

I realized that I was probably upset over him referring to our more intimate moments as a sin. It made me wonder if he ever regretted doing it with me or if he ever had to mentally brace himself right before we have sex.

I had low self-esteem and was critical of my own body way before I met him, and I have been more and more confident (we have been trying to help each other with this) ever since I kept communication with my mom to a minimum.

Sorry if any of my sentences seem confusing. I’ve been awake because of all the overthinking with less than 3 hours left until we have to get up for work.