Take the first thing that O'Brien says to Winston after his capture. Winston has been beaten mercilessly for days, and they wheel him to O'Brien. Here is what O'Brien says to Winston:
"Don't worry Winston; you are in my keeping. For seven years I have watched over you. Now the turning point has come. I shall save you, I shall make you perfect."
Can was say Christ figure? In this quote, O'Brien is setting himself up as Winston's savior. He is the one who will be able to make Winston perfect (as in Christianity, Christ does). However, the only way that Winston can become "perfect" is to accept O'Brien and his "religion," or viewpoint. That all ties back to religion, Christ, and the concept of the Atonement. They've just taken God and Christ out of the picture, and instead replaced them with the Party and O'Brien.
Later, O'Brien is trying to convince Winston that Oceania has always been at war with Eastasia. Winston says that this is not true, because he can clearly remember a time when it wasn't. O'Brien responds, "Whatever the Party holds to be truth is truth," another reference that can be tied to the Party as a religion. Religions all claim to have the truth, the ultimate truth of the meaning of life, and here O'Brien is saying that the only truth comes from the Party.
When O'Brien is comparing the Party's tactics to the tactics of previous dictatorships in history, he is mentioning key differences. One of them is that their regime requires total belief and submission in the mind. He says,
"We convert him, we capture his inner mind, we reshape him. We burn all evil and all illusion out of him; we bring him over to our side, not in appearance, but genuinely, heart and soul."
His reference to conversion, and taking their mind, heart and soul is another aspect of religion. In order to believe in a religion, you must be converted; in your heart and mind, you must believe that it is true and good. And that is what the Party seeks to do in the "Ministry of Love"; it seeks to convert people to their world and philosophy, just as religion does.
I hope that helped; good luck!