According to U Nebraska political science prof Carson Holloway, atheism is not only fundamental to the power of the Party in 1984 but is also its central weakness:
Only the Party itself is immortal. Unthinking and unconditioned subservience enables Winston and his fellows to participate, however faintly and briefly, in that immortality.
Submission is made easier by the dogma that there is no objective reality…
In that case, atheism is not only fundamental to the Party’s power but is also its central weakness: If there is evidence for any higher power in the universe, the Party cannot be what it claims. Objective reality, apart from the Party’s version, then certainly exists. There would be a record of what really happened in, say, the Mind of God. Then, the basis of the Party’s authority (total control of reality) collapses…News, “How Orwell’s 1984 can be seen as an argument for God’s existence” at Mind Matters News
See also: Here’s why an argument for God’s existence is scientific. The form of reasoning and the type of evidence accepted is the same as with Newton’s theories or Darwin’s. (Michael Egnor)