What details show the importance of Christian beliefs in the epic? Beowulf

God is good (Beowulf) while Satan is bad (Grendel and his mother), God vs Satan!

Like God desires the glory (Beowulf's desire for glory) !

In Bible it is repeatedly mentioned to love men like God, another thing we can derive from the epic.

Satan is always finding ways to deceive mankind.

And finally that whatever you do the sin will always bear consequence.