Answer:
Because Beowulf is the oldest record of the archaic English language, in addition to showing concepts of the Christian religion, one of the most influential in the world today.
Explanation:
Beowulf is an Anglo-Saxon epic poem and is one of the most important narratives not only in English literature, but in world literature.
Beowulf is an ancient poem, written millions of years ago, being the first record of Old English spoken by Anglo-Saxons.
In addition, Beowulf brings diverse cultural elements and can be observed in different cultures today showing the influence that the mixture of peoples had in the world.
Beowulf brings many elements of paganism, but it is likely that some of these elements have been modified over time to present cirstan elements. This reinforces the importance of this poem worldwide, since Cyrstianism is one of the most popular religions in the world and the poem shows suppression of English culture to pagan and alternative practices.