Can someone explain how this story is a Christian allegory?

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At least to me, the premise of this movie is very similar to the story of Noah's ark. Scott tries to convince the other passengers to climb the Christmas tree so they can reach the outer hull. He is staged very high over the passengers down below like he's giving a sermon on the mount. The passengers choose to stay where they are as they have been told. Eventually, when the seawater flood the dining room, they try to climb the Christmas tree, but it's too late and they drown.

While it's not mentioned in the Old Testament, the New Testament hints that Noah warned the world of the incoming flood, but they didn't listen. In the end, there are only a few survivors who remain.

I've seen this movie repeatedly for decades and don't get see it at all as an allegory. Where on earth are people getting that idea?

Scott's sacrificed himself for others.