What is the style, the language used and how the atmosphere is created?It is for an oral book report.

In The Old Man and the Sea, Ernest
Hemingway uses a plain, straightfoward style of 3rd person narration that is common to
most religious parables and allegories.

Hemingway uses many
simple sentences, unadorned description, and a matter-of-fact dialogue to create
believability.  In short, Hemingway's style is without pathos (emotional appeal).
 Rather, the old man is based on logos (logic) and
ethos (ethics).

The mood of the
novella is based on religious allegory: it is a contemplation on man alone in nature
suffering, much like Jesus' temptation in the desert or Jonah and the
Whale.