Step 1: Identifying the errors.
Let's analyze each sentence to find the incorrect parts.
A. At the beginning of those two weeks, I evangelized courageous to my roommate: The word "evangelized" is incorrectly used here. "Evangelize" means to preach or spread a belief, which doesn't fit the context. The correct expression might be "I encouraged my roommate" or "I explained enthusiastically." Also, "courageous" is an adjective, which doesn't fit with "evangelized." This sentence is incorrect.
B. Isn’t this fantastic? I would say. But I saw he does not have the same interest: "I would say" is awkward and doesn't fit in this sentence. A better phrase would be "I would say, isn't it?" or just remove "I would say." Also, "I saw he does not have the same interest" should be "I saw that he did not have the same interest." This sentence is incorrect.
C. Slowly I retreated to my room. I became ashamed of the consumption: This sentence is grammatically correct, though "the consumption" is somewhat vague. However, it does not contain any major grammatical error.
D. and the only way to compare the shame is to an addict and his addiction: The phrasing "to an addict and his addiction" is incorrect. It should be "to an addict and his addiction" should be "with an addict and his addiction," as "compare with" is the correct phrasing for comparison. This sentence is incorrect.
Step 2: Conclusion.
The incorrect sentences are B and D, as they both contain grammatical issues.