What are Grendel's thoughts about God or gods throughout the epic?

Very little is stated about how Grendel, from the Epic
Poem Beowulf, feels about God. While little is said, enough is
given to the reader to establish that Grendel hated
God.

Typically, in Anglo-Saxon literature, the antagonist
of the hero (in this case Grendel) was characterized as a "God-Hater." Written from a
Christian perspective, Beowulf is no
different.

In the early description of Grendel it is stated
that he is a descendant of Cain:

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Grendel this monster grim was called,

march-riever mighty, in moorland living,
in fen and fastness; fief
of the giants
the hapless wight a while had kept
since the Creator
his exile doomed.
On kin of Cain was the killing avenged
by sovran
God for slaughtered
Abel.

Here, the reader is
shown that Grendel has been exiled by God based upon the fact that he is a descendant of
Cain. (What this refers to is the fact that Cain, jealous of God's acceptance of Abel's
sacrifice, murders his brother. God sees the hatred in Cain and exiles him to darkness.)
Therefore, given all creatures

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Etins and elves and evil-spirits,
as
well as the giants that warred with
God

should be exiled to
darkness as well. Given that Grendel is an evil spirit, he is exiled to darkness as
well.

Grendel, angered that he cannot exist in light (and
therefore in God's graces) wages war on the people of Heorot. Grendel, unable to enact
his anger against God himself, wages war on the Heorot and its inhabitants (given they
are able to exist in light).

Basically, Grendel despises
God and, therefore, Christianity.