While not openly spoken of in William Shakepseare's Macbeth, imagery and allusions to Christianity can be found within the play. Essentially, the overpowering religion found in the play speaks to Pagan ideology. The appearance of the witches, the prophecies, and Lady Macbeth's calling of the spirits to "unsex" her all point to Pagan ideology.
That said, when readers examine the text more closely, readers can see the allusion to the fall of Adam in the Garden of Eden. For Adam, the garden represented the perfect place to exist. Likewise, for Macbeth, he desired nothing but the throne. He thought the throne was his perfect place.
Essentially, the allusion compounds when one brings Lady Macbeth into the equation. Lady Macbeth could be compared to Eve. It is Eve's fault that Adam was thrown out of the garden. She brought sin to Adam. Likewise, Lady Macbeth brings sin into Macbeth's life. It is her pressure, regarding the murder of Duncan, which leads Macbeth down the path of sin. After convincing Macbeth to murder (like Eve convinced Adam to take of the Forbidden Fruit), he leads a life filled with more sin.