well prepare yourself for them to perhaps try to encourage you to go to meetings, or take literature. They must obviously still love your mother if her pictures are still up. They will want to "save you and your family".. the question is, if it is brought up (religion) how do you respond? If you knock the religion, you may find you alienate yourself from building a relationship with them. If they are in their 70s, chances are that you aren't going to 'break them out' .. so remember what it is worth to you to have them in your life.. they won't be around all that great many years to come.. if it was me.. I'd avoid talking religion and be as tactful as possible