It is agreed by almost all critics that Beowulf was once a pre-Christian poem but no one is completely sure how it went from pre-Christian to Christian influenced. There are many ideas of how it was written and one of the most popular theories is that the poem was already in poetic form and the author's own beliefs were added. Another theory is that the poem was written by a Christian who heard the story and added some of his own beliefs when he wrote it. A third theory is that the poem was already written and a Christian revised it and added ....