How do i tell my catholic girlfriend that im an atheist?

On gang i dont know how to tell her. I been going to church with her family for the last 5 months. I feel like if she knew she wouldnt be fw me no more. This one of them white girls thats obsessed with ts. I was just tryna crack when i met her so thats why i started going to chrurch with them. I end up actually liking her fr , so i just kept going to keep our relationship type shit. But its getting to a point,im not tryna keep going to chrurch when i dont belong there . I feel like she love me type shit, enough that she could still be with me regardless of my religious choices

What yall boyz would do if yall was me?