What to say to Grandma?

[MTL]

I do not think that refusing to discuss it is going to get the desired results.  I think the only way to stop her grandmother from bothering her about this is to either convince her grandmother that there is no god, or make the conversation sufficiently unpleasant for her grandmother so that her grandmother will not want to bring up the subject.  Otherwise, what is going to stop her grandmother from bothering her for as long as she lives?

I think the most likely outcome of not talking about it will be that her grandmother continues to pester her about this until she is dead.

Ok, so we can agree to disagree.

I got the distinct impression that cosmowanderer initially, and repeatedly, tried to avoid the subject.

If she WANTS to get into it, power to her.

I would love nothing more than to see a discussion between a Theist family and an Atheist family member
result in the Theists either becoming Atheists, or at least retreating with their tails between their legs.

I would LOVE it.

but my experience says that this is not likely to be the outcome,
and cosmowanderer will come out the worse for it.

Not because she's wrong, but simply because Theism is stupid,
and there's no cure for stupid;

and because these are not merely Theists,
they are her family.

So we can disagree.

My advice is to shut the issue down and make it clear to her grandmother that she is doing so BECAUSE
A. She has boundaries that deserve respect too
B. She wants to preserve the relationship