Members of the church of Christ

I need help with what to say to my mother-in-law. She is Pentecostal and I can't have a conversation with her without her bringing up religion and how she believes her church is the right church and that I'm wrong. She just joined her church a few months ago and didn't know anything about the bible. She just believes whatever her pastor tells her. I don't want to offend her so I try not to answer back. What can I say to get her to stop talking about religion? This is really hard because she lives with us.