Mostly Anglican Christian, with Non-Conformist Christianity coming second. After that, Roman Catholicism and Islam come about equal third place.
the UK's religion is Christianity
Anglican Christianity is the dominant UK religion.
The religion of the nile river is mostly just Eqyptian.
Hindu is a religion, not an ethnicity.
European religion is mostly Christian. Whereas India is mostly Hindu or Buddhist.
that is not a religion but is an Islamic name
It has no official religion, but is mostly Catholic.
Mostly Anti religion, some pagans.
Islam is a religion. Your question is incoherent.
It is mostly Christianity.
Islam mostly
there mostly Muslim