Changing for a relationship


I am an aithest while my boyfriend is not, he is a christian. he keeps bringing on the topic of god and its making me really uncomfortable. he says he just wants me to believe so we can have enteral life together. this is driving me crazy and he keeps saying "no one will even have to know you're not aithest anymore " and i dont know what to do. definitely something I can personally get over but i dont know if he can change topics. any suggestions or advice?