I think it's ignorant as iirc a lot of them DO tell people where they go when they die.
But in the end, and let's be honest here, nobody on this earth actually knows for certain where we go when we die. A lot of people have theories, and some of them are admittedly good, but we still have no real idea on where we go when we die.
Again, I personally believe that there's a 50% chance we go to some type of afterlife/linger as a ghost, and a 50% chance we just cease to exist (or cease to be conscious, if that makes sense?), but I'm not going around here calling everyone else morons for having their own personal ideas on what happens after death like reincarnation, heaven or hell, becoming an angel, etc.
And at the end of the day, the more you constantly press people on whether or not their religion is REALLY valid (especially and specifically when nobody really initiates these conversations), the more you risk just being ignored and seen as an overly religious zealot.