I think that the strongest type of figurative language the author uses in her post is rhetorical questions. She has kind of the same question all throughout the post, "Should Christians celebrate Christmas" and then she continues to answer that in different and descriptive ways all throughout the post. For example, she asks the question and then goes into the factual evidence, then she asks it again and goes into a moral/personal opinionated standpoint, and finally, she asks it again as more of a personal, rhetorical question for the audience to think about for themselves.
I think this works for the author because she continually wants to reach to all types of audiences on a logical and emotional level. She wants the audience to keep considering their beliefs and asking themselves if the way they celebrate is actually how they should celebrate it. So she'll ask the question, let the audience think about how they celebrate, and then give a "better" reason to do it through different types of reasoning's.