Pagan death rituals are predominantly rafts sent to sea or firey pyres, as seen in Iliad. Beowulf's death ritual was a fiery pyre, as assuredly pagan as is the ritual of piling on of riches. Pagan ceremonies include the belief that souls require possessions in the afterlife. This is opposite to the Christian belief of a possession-free afterlife. Note that Beowulf did not request the treasure be sent with him. He only requested a memorial:
The wise old man
spake much in his sorrow, and sent you greetings
and bade that ye build, when he breathed no more,
on the place of his balefire a barrow high,
The text says he was the mightiest of men while he was alive and "had joy of his jewels and burg"--while alive The Christian element comes in to play (1) at his request for a memorial only and (2) at his warriors' decision to not cast lots for possession of the treasure,
No lots they cast for keeping the hoard
when once the warriors saw it in hall,
and (3) in their decision to put the treasure away again in the safekeeping of Beowulf's burial mound barrow. This is a Christian demonstration of the belief in the immaterilaity of material wealth.
THEN fashioned for him the folk of Geats
firm on the earth a funeral-pile,
and hung it with helmets and harness of war
and breastplates bright, as the boon he asked;
and they laid amid it the mighty chieftain,
heroes mourning their master dear.
Then on the hill that hugest of balefires
In heavy mood
their misery moaned they, their master’s death.
The smoke by the sky was devoured.
The folk of the Weders fashioned there
on the headland a barrow broad and high,
by ocean-farers far descried:
in ten days’ time their toil had raised it,
the battle-brave’s beacon. Round brands of the pyre
a wall they built, the worthiest ever
that wit could prompt in their wisest men.
They placed in the barrow that precious booty,
the rounds and the rings they had reft [taken] erewhile,
[those] hardy heroes, from hoard in cave, --