Comment by graemep

AFAIK I know it is a "core activity" in one Abrahamic religion (Islam)—more so than in any other major religion.

A lot of Christians I know have done some sort of pilgrimage. Quite a few Buddhists too (most of those I know if you count short and easy trips).

I agree it is very common, but I cannot see a correlation between how ancient a religion is and how important pilgrimage is within in it.