My mom is constantly pushing religion on me and my children. How can I get her to stop?

I grew up in a very strict, evangelical home where religion and attending church was paramount. Despite a Christian facade, my home was plagued with dysfunction and addiction. I am still trying to heal my relationship with my mother who has moved 2000 miles away. My husband and I have decided to raise our boys away from the church but with the values that we feel model Jesus' teachings such as empathy, tolerance, kindness and honesty. My boys, five and seven, are incredibly grounded and respectful. I rarely see my mom. When she is around, her main topic of conversation is God and how she is born again and how I am sinful for not raising my children in church. She knows that I believe in living by example and that I often talk to my children about God. Her last visit to my home resulted in her putting the fear of the devil into my children and consequently "saving" them when I thought she was reading to them. Doing this behind my back really crossed the line. I don't know what to do.