I want to share this with him, and hopefully by extension, slowly lead him down the path, but he shuts me down each time with "I don't believe in that stuff, so please stop" or something similar, and then we end up in a fight.
I'm at my wit's end, I don't know what to do, I want him to let me share my love of God and Jesus and slowly lead him down the path towards salvation, and he won't let me, any tips?
It's pointless to try sharing your "love for jesus/god" with an atheist. Share your love for each other. Forget about imaginary beings.
He simply isn't interested in hearing about unfounded beliefs.
I know this is hard for someone on your level of indoctrination to understand, but think about how you might feel if your boyfriend suddenly decided that he loved Snow White and had a deep and loving relationship with her and that after his death, he would be with her forever.
Yes, that's how ridiculous what you're saying sounds to him. And the fairytale of Snow White was inspired by a real person too.