Wow Freebubbles...that should have shifted some frustration! I think these Christians are probably well intentioned in that they really do believe they are saving yours and your aunt's soul & that is why they are so insistent. There are however many different churches & approaches, some much more open to discussion & it sounds like you haven't found one that is the 'right fit' for you as yet.
I'm not a Christian, though I respect many people who live by true Christian values and have Christian friends and clients. My personal belief is that there are many routes to the Divine & it is how you live your life that determines your future, not your choice of religion. However I know this isn't the view of most people & I don't try to 'convert' anyone!
Your aunt, being Christian, would need to be helped with something she feels comfortable with, therefore I agree that to sit with her & pray for protection is probably the best method.