So my (formerly agnostic, now atheist) friend (Christian) is very Christian and obsesses over it. Her only friends besides me are Christian and all they talk about is the Bible, Jesus, and God. She also tries to “convert” people. She tried to convert me by asking what my relationship with God as like, if I read the Bible, etc. and tried to get me to apologize to God for being agnostic and not Christian “for Christianity is the only true religion and He will come soon”.
She constantly talks about it like I said and constantly tries to get me to convert every time we talk.
Ask her if she’s ever been friends with someone who became interested in her, that she wasn’t interested in but who kept pestering her to go out with him/her. Spend some time commiserating about the experience, how awkward it made every interaction, how she constantly had to be on guard, how she was never sure when he might try again, and how she had to continually check for potential double-meanings or pitfalls. The guy has been told No multiple times but you’re just not interested, yet he send to think if he just keeps badgering at you, you’ll give in and date him.
Then tell her that that’s what her constantly bringing up religion is like for you. And that “No means No” applies to more than just sex.