There will always be religion, especially if and when the civilized world ends.

A better way would be just to remind everyone that there were countless religions before and that they were all man made, corrupted and fell apart after a certain amount of time.

Remind everyone that there is no one true religion because there never was one before, there isn't one now and there never will be be one.

But I'm afraid that as much as we'll try .... people will always be dumb enough to want to believe in fairy tales, an after life, eternal bliss / hell and that one group is better than another.