Don't change. It wouldn't be true .... you have to be yourself!

The choice is entirely yours.

If it were me, I would not hesitate to dump the person with a "Well, it's been nice knowing you but I value truth and honesty over superstitions dishonestly, via virtue of faith (belief without evidence) asserted as facts. Goodbye.

As I require mutual respect for an intimate relationship and I will not respect anyone who values faith over realty or would expect me to lower my standards of truth "demonstrable" to their definition of "Truth" "whatever they choose to believe without evidence." I would waste no more time with the person.

Be warned: Such standards may have their repercussions. I fully anticipate living my life alone as most in these parts are theists. If I were to lower my standards of truth and honesty, I could quickly find a partner but at a cost I am not willing to sacrifice.

There shouldnt be a condition like that to love someone. If you need to change to be loved by a person they are not offering real love. Say bye and move on

Say byebye.
Seriously. That's bullshit.

You can go along and pretend, but you'll hate yourself.

Why should you change? You're incompatible.

Laugh in her face about how absurd her request is. Like, a howling knee slapper, next time she brings it up. I'm not kidding. That "prove yourself to me" can get bent.

You can play along for a while to learn whether you really love her or not. Being an atheist is the opposite of being pious, even about atheism itself. The most important thing is your happiness. Have fun!