From a personal take:
Anglo-Saxon and the Norse language were the first in forming English.
"Pagan" is used to denote a lot of faiths and occults; mainly pre-2nd testament (suchas animal sacrifice rather than Christ's blood for atonement/forgiveness of sin)
Magickal practice comes from Anglo when you are an English speaker predominantly because what you speak outloud in the sense of phoenetics and pneumonics (phoenix) is what you summon.
I bear thee fair well.

TLDR: What you speak is what you summon and Anglo-Saxon is what English was derived from.