Why don't "Christians" act like Christians?

Lukewarm No More!

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I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth. Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: ... As many as I love, I rebuke and chasten: be zealous therefore, and repent. [Rev 3.15-19]