<human>: I don't really know if it's appropriate for this subreddit since we are both underage, but I don't know what else to do and I'm desperate for advice. This is clearly blind teenage love so please bear with me.

Her mother just found out I'm an atheist and is clearly not OK with my beliefs, she has told several times to my gf that I'll go and burn in hell, which have made her really upset and made me really sad. She has already subtly hinted her to leave me. This has been going for two weeks now and I haven't seen her since.

They are both christians and not extremists by any means which is why it caught me off gaurd. I've never (surprisingly) dealt with this kind of discrimination either so I have no idea how to approach this.
I wanna say something to her, try to convince her or something, but I don't know what to say. 

We used to go out every 4 days or so, not anymore. I really wanna keep going out with my gf. Help me reddit, you are my only hope.

Can you summarize the given text in a few sentences?
<bot>: My gf's mom hates that I am an atheist, this is detrimental to our relationship, how can I win her back?