[BMCDA]

That's certainly true though sometimes a new idea (whatever its nature) only convinces the younger generations and so it spreads over time as the older generations die out.
Planck once said: "A scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die and a new generation grows up that is familiar with it". And I think this also applies to religions (and of course to other memes as well).

[edwin hubble]

Well, yes... memes would die out as the user-population dies. (We will see some of this as Europeans fail to replace themselves.)
But then memes (and religions) can grow exponentially During a human lifetime.(Christianity, Islam)

[edwin hubble]

and thanks for the quote from Planck.
It was Kim Stanley Robinson who wrote "history is Lamarckian".