What do about someone who questions why I do not go to their church?

I have a aunt who is deeply religious and thinks bad of people who do not attend church every single Sunday or whenever they have a church activity going on. Anytime sees me she questions why I have not been to church. Her husband does the same thing too. I simply have not been to her church because I just feel like its full of extremist bigots. She is even trying to bring my boyfriend into this and he does not like the church as well. Her kids are just brainwashed to the highest order. They use god to defend any action they have and they think low of anyone who is not religious like them. Then my aunt and her husband act like I am some kind of devil spawn because I did not know of everything that came out of the bible...If I tell them my opinion about the church they just want leave me alone and keep pushing me to go to their church.